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< / div > < div class = "- topic/body concept/conbody body conbody" > < p class = "- topic/p p" data-ofbid = "d105671e22__20250121171540" > < code class = "+ topic/ph pr-d/codeph ph codeph" > USB Interface< / code > 这一层次的驱动就非常的多了，这一层主要是在 USB 传输层之上，针对 USB Device 的某个功能
< code class = "+ topic/ph pr-d/codeph ph codeph" > Function< / code > 开发对应的 USB 功能业务驱动，即常说的 < code class = "+ topic/ph pr-d/codeph ph codeph" > USB Client
Software< / code > 。在 USB 定义中，一个 < code class = "+ topic/ph pr-d/codeph ph codeph" > Interface< / code > 就是一个
< code class = "+ topic/ph pr-d/codeph ph codeph" > Function< / code > 。< / p > < div class = "- topic/p p" data-ofbid = "d105671e38__20250121171540" > < code class = "+ topic/ph pr-d/codeph ph codeph" > USB Interface< / code > Driver 对应的数据结构为 < code class = "+ topic/ph pr-d/codeph ph codeph" > struct usb_driver< / code > ，使用
< code class = "+ topic/ph pr-d/codeph ph codeph" > usb_register_driver()< / code >
函数进行注册：< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "usb_host_interface_driver_struct_usb_driver__pre_ums_14z_21c" data-ofbid = "usb_host_interface_driver_struct_usb_driver__pre_ums_14z_21c" > < strong class = "hl-keyword" > int< / strong > usb_register_driver(< strong class = "hl-keyword" > struct< / strong > usb_driver *new_driver, < strong class = "hl-keyword" > struct< / strong > module *owner,
< strong class = "hl-keyword" > const< / strong > < strong class = "hl-keyword" > char< / strong > *mod_name)
{
< em class = "hl-comment" > /* (1) 设置 devices 标志为 0， < / em >
new_driver-> drvwrap.for_devices = < span class = "hl-number" > 0< / span > ;
new_driver-> drvwrap.driver.name = new_driver-> name;
new_driver-> drvwrap.driver.bus = & usb_bus_type;
new_driver-> drvwrap.driver.probe = usb_probe_interface;
new_driver-> drvwrap.driver.remove = usb_unbind_interface;
new_driver-> drvwrap.driver.owner = owner;
new_driver-> drvwrap.driver.mod_name = mod_name;
new_driver-> drvwrap.driver.dev_groups = new_driver-> dev_groups;
spin_lock_init(& new_driver-> dynids.lock);
INIT_LIST_HEAD(& new_driver-> dynids.list);
retval = driver_register(& new_driver-> drvwrap.driver);
}
< / pre > < / div > < div class = "- topic/p p" data-ofbid = "d105671e50__20250121171540" > 一个最简单的 < code class = "+ topic/ph pr-d/codeph ph codeph" > Usb Interface Driver< / code > 是 < code class = "+ topic/ph pr-d/codeph ph codeph" > usb_mouse_driver< / code >
:< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "usb_host_interface_driver_struct_usb_driver__codeblock_ors_24z_21c" data-ofbid = "usb_host_interface_driver_struct_usb_driver__codeblock_ors_24z_21c" > < strong class = "hl-keyword" > static< / strong > < strong class = "hl-keyword" > const< / strong > < strong class = "hl-keyword" > struct< / strong > usb_device_id usb_mouse_id_table[] = {
{ USB_INTERFACE_INFO(USB_INTERFACE_CLASS_HID, USB_INTERFACE_SUBCLASS_BOOT,
USB_INTERFACE_PROTOCOL_MOUSE) },
{ } < em class = "hl-comment" > /* Terminating entry */< / em >
};
MODULE_DEVICE_TABLE (usb, usb_mouse_id_table);
< strong class = "hl-keyword" > static< / strong > < strong class = "hl-keyword" > struct< / strong > usb_driver usb_mouse_driver = {
.name = < span class = "hl-string" > "usbmouse"< / span > ,
.probe = usb_mouse_probe,
.disconnect = usb_mouse_disconnect,
.id_table = usb_mouse_id_table,
};
module_usb_driver(usb_mouse_driver);< / pre > < / div > < ul class = "- topic/ul ul" id = "usb_host_interface_driver_struct_usb_driver__ul_wms_14z_21c" data-ofbid = "usb_host_interface_driver_struct_usb_driver__ul_wms_14z_21c" > < li class = "- topic/li li" data-ofbid = "d105671e61__20250121171540" >
< div class = "- topic/p p" data-ofbid = "d105671e63__20250121171540" > 首先根据得到的 endpoint 准备好 urb，
设备：< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "usb_host_interface_driver_struct_usb_driver__pre_xms_14z_21c" data-ofbid = "usb_host_interface_driver_struct_usb_driver__pre_xms_14z_21c" > < strong class = "hl-keyword" > static< / strong > < strong class = "hl-keyword" > int< / strong > usb_mouse_probe(< strong class = "hl-keyword" > struct< / strong > usb_interface *intf, < strong class = "hl-keyword" > const< / strong > < strong class = "hl-keyword" > struct< / strong > usb_device_id *id)
{
< strong class = "hl-keyword" > struct< / strong > usb_device *dev = interface_to_usbdev(intf);
< strong class = "hl-keyword" > struct< / strong > usb_host_interface *interface;
< strong class = "hl-keyword" > struct< / strong > usb_endpoint_descriptor *endpoint;
< strong class = "hl-keyword" > struct< / strong > usb_mouse *mouse;
< strong class = "hl-keyword" > struct< / strong > input_dev *input_dev;
< strong class = "hl-keyword" > int< / strong > pipe, maxp;
< strong class = "hl-keyword" > int< / strong > error = -ENOMEM;
interface = intf-> cur_altsetting;
< strong class = "hl-keyword" > if< / strong > (interface-> desc.bNumEndpoints != < span class = "hl-number" > 1< / span > )
< strong class = "hl-keyword" > return< / strong > -ENODEV;
< em class = "hl-comment" > /* (1) 得到当前 interface 中的第一个 endpoint， < / em >
endpoint = & interface-> endpoint[< span class = "hl-number" > 0< / span > ].desc;
< strong class = "hl-keyword" > if< / strong > (!usb_endpoint_is_int_in(endpoint))
< strong class = "hl-keyword" > return< / strong > -ENODEV;
pipe = usb_rcvintpipe(dev, endpoint-> bEndpointAddress);
maxp = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
mouse = kzalloc(< strong class = "hl-keyword" > sizeof< / strong > (< strong class = "hl-keyword" > struct< / strong > usb_mouse), GFP_KERNEL);
< em class = "hl-comment" > /* (2.1) 分配 input device */< / em >
input_dev = input_allocate_device();
< strong class = "hl-keyword" > if< / strong > (!mouse || !input_dev)
< strong class = "hl-keyword" > goto< / strong > fail1;
mouse-> data = usb_alloc_coherent(dev, < span class = "hl-number" > 8< / span > , GFP_ATOMIC, & mouse-> data_dma);
< strong class = "hl-keyword" > if< / strong > (!mouse-> data)
< strong class = "hl-keyword" > goto< / strong > fail1;
< em class = "hl-comment" > /* (3.1) 分配 urb */< / em >
mouse-> irq = usb_alloc_urb(< span class = "hl-number" > 0< / span > , GFP_KERNEL);
< strong class = "hl-keyword" > if< / strong > (!mouse-> irq)
< strong class = "hl-keyword" > goto< / strong > fail2;
mouse-> usbdev = dev;
mouse-> dev = input_dev;
< strong class = "hl-keyword" > if< / strong > (dev-> manufacturer)
strlcpy(mouse-> name, dev-> manufacturer, < strong class = "hl-keyword" > sizeof< / strong > (mouse-> name));
< strong class = "hl-keyword" > if< / strong > (dev-> product) {
< strong class = "hl-keyword" > if< / strong > (dev-> manufacturer)
strlcat(mouse-> name, < span class = "hl-string" > " "< / span > , < strong class = "hl-keyword" > sizeof< / strong > (mouse-> name));
strlcat(mouse-> name, dev-> product, < strong class = "hl-keyword" > sizeof< / strong > (mouse-> name));
}
< strong class = "hl-keyword" > if< / strong > (!strlen(mouse-> name))
snprintf(mouse-> name, < strong class = "hl-keyword" > sizeof< / strong > (mouse-> name),
< span class = "hl-string" > "USB HIDBP Mouse %04x:%04x"< / span > ,
le16_to_cpu(dev-> descriptor.idVendor),
le16_to_cpu(dev-> descriptor.idProduct));
usb_make_path(dev, mouse-> phys, < strong class = "hl-keyword" > sizeof< / strong > (mouse-> phys));
strlcat(mouse-> phys, < span class = "hl-string" > "/input0"< / span > , < strong class = "hl-keyword" > sizeof< / strong > (mouse-> phys));
< em class = "hl-comment" > /* (2.2) 初始化 input device */< / em >
input_dev-> name = mouse-> name;
input_dev-> phys = mouse-> phys;
usb_to_input_id(dev, & input_dev-> id);
input_dev-> dev.parent = & intf-> dev;
input_dev-> evbit[< span class = "hl-number" > 0< / span > ] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
input_dev-> keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
input_dev-> relbit[< span class = "hl-number" > 0< / span > ] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
input_dev-> keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) |
BIT_MASK(BTN_EXTRA);
input_dev-> relbit[< span class = "hl-number" > 0< / span > ] |= BIT_MASK(REL_WHEEL);
input_set_drvdata(input_dev, mouse);
input_dev-> open = usb_mouse_open;
input_dev-> close = usb_mouse_close;
< em class = "hl-comment" > /* (3.2) 初始化 urb */< / em >
usb_fill_int_urb(mouse-> irq, dev, pipe, mouse-> data,
(maxp > < span class = "hl-number" > 8< / span > ? < span class = "hl-number" > 8< / span > : maxp),
usb_mouse_irq, mouse, endpoint-> bInterval);
mouse-> irq-> transfer_dma = mouse-> data_dma;
mouse-> irq-> transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
< em class = "hl-comment" > /* (2.3) 注册 input device */< / em >
error = input_register_device(mouse-> dev);
< strong class = "hl-keyword" > if< / strong > (error)
< strong class = "hl-keyword" > goto< / strong > fail3;
usb_set_intfdata(intf, mouse);
< strong class = "hl-keyword" > return< / strong > < span class = "hl-number" > 0< / span > ;
fail3:
usb_free_urb(mouse-> irq);
fail2:
usb_free_coherent(dev, < span class = "hl-number" > 8< / span > , mouse-> data, mouse-> data_dma);
fail1:
input_free_device(input_dev);
kfree(mouse);
< strong class = "hl-keyword" > return< / strong > error;
}
< / pre > < / div >
< / li > < li class = "- topic/li li" data-ofbid = "d105671e68__20250121171540" >
< div class = "- topic/p p" data-ofbid = "d105671e70__20250121171540" > 在 input device 被 open 时提交 urb
启动传输：< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "usb_host_interface_driver_struct_usb_driver__pre_zms_14z_21c" data-ofbid = "usb_host_interface_driver_struct_usb_driver__pre_zms_14z_21c" > < strong class = "hl-keyword" > static< / strong > < strong class = "hl-keyword" > int< / strong > usb_mouse_open(< strong class = "hl-keyword" > struct< / strong > input_dev *dev)
{
< strong class = "hl-keyword" > struct< / strong > usb_mouse *mouse = input_get_drvdata(dev);
mouse-> irq-> dev = mouse-> usbdev;
< em class = "hl-comment" > /* (1) 提交初始化好的 usb， < / em >
< strong class = "hl-keyword" > if< / strong > (usb_submit_urb(mouse-> irq, GFP_KERNEL))
< strong class = "hl-keyword" > return< / strong > -EIO;
< strong class = "hl-keyword" > return< / strong > < span class = "hl-number" > 0< / span > ;
}
< / pre > < / div >
< / li > < li class = "- topic/li li" data-ofbid = "d105671e75__20250121171540" >
< div class = "- topic/p p" data-ofbid = "d105671e77__20250121171540" > 在传输完 urb 的回调函数中，根据读回的数据上报 input 事件，并且重新提交 urb
继续查询：< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "usb_host_interface_driver_struct_usb_driver__pre_bns_14z_21c" data-ofbid = "usb_host_interface_driver_struct_usb_driver__pre_bns_14z_21c" > < strong class = "hl-keyword" > static< / strong > < strong class = "hl-keyword" > void< / strong > usb_mouse_irq(< strong class = "hl-keyword" > struct< / strong > urb *urb)
{
< strong class = "hl-keyword" > struct< / strong > usb_mouse *mouse = urb-> context;
< strong class = "hl-keyword" > signed< / strong > < strong class = "hl-keyword" > char< / strong > *data = mouse-> data;
< strong class = "hl-keyword" > struct< / strong > input_dev *dev = mouse-> dev;
< strong class = "hl-keyword" > int< / strong > status;
< strong class = "hl-keyword" > switch< / strong > (urb-> status) {
< strong class = "hl-keyword" > case< / strong > < span class = "hl-number" > 0< / span > : < em class = "hl-comment" > /* success */< / em >
< strong class = "hl-keyword" > break< / strong > ;
< strong class = "hl-keyword" > case< / strong > -ECONNRESET: < em class = "hl-comment" > /* unlink */< / em >
< strong class = "hl-keyword" > case< / strong > -ENOENT:
< strong class = "hl-keyword" > case< / strong > -ESHUTDOWN:
< strong class = "hl-keyword" > return< / strong > ;
< em class = "hl-comment" > /* -EPIPE: should clear the halt */< / em >
< strong class = "hl-keyword" > default< / strong > : < em class = "hl-comment" > /* error */< / em >
< strong class = "hl-keyword" > goto< / strong > resubmit;
}
< em class = "hl-comment" > /* (1) 根据 urb 读回的数据，上报 input event */< / em >
input_report_key(dev, BTN_LEFT, data[< span class = "hl-number" > 0< / span > ] & < span class = "hl-number" > 0x01< / span > );
input_report_key(dev, BTN_RIGHT, data[< span class = "hl-number" > 0< / span > ] & < span class = "hl-number" > 0x02< / span > );
input_report_key(dev, BTN_MIDDLE, data[< span class = "hl-number" > 0< / span > ] & < span class = "hl-number" > 0x04< / span > );
input_report_key(dev, BTN_SIDE, data[< span class = "hl-number" > 0< / span > ] & < span class = "hl-number" > 0x08< / span > );
input_report_key(dev, BTN_EXTRA, data[< span class = "hl-number" > 0< / span > ] & < span class = "hl-number" > 0x10< / span > );
input_report_rel(dev, REL_X, data[< span class = "hl-number" > 1< / span > ]);
input_report_rel(dev, REL_Y, data[< span class = "hl-number" > 2< / span > ]);
input_report_rel(dev, REL_WHEEL, data[< span class = "hl-number" > 3< / span > ]);
input_sync(dev);
resubmit:
< em class = "hl-comment" > /* (2) 重新提交 urb 继续查询 */< / em >
status = usb_submit_urb (urb, GFP_ATOMIC);
< strong class = "hl-keyword" > if< / strong > (status)
dev_err(& mouse-> usbdev-> dev,
< span class = "hl-string" > "can't resubmit intr, %s-%s/input0, status %d\n"< / span > ,
mouse-> usbdev-> bus-> bus_name,
mouse-> usbdev-> devpath, status);
}
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