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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/usb/usb-host-interface-driver_struct_usb_driver.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">Driver (struct usb_driver)</h1><div class="date inPage">31 Jan 2024</div><div style="color: gray;">
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Read time: 6 minute(s)
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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
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<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
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Software</code>。在 USB 定义中，一个 <code class="+ topic/ph pr-d/codeph ph codeph">Interface</code> 就是一个
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<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
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<code class="+ topic/ph pr-d/codeph ph codeph">usb_register_driver()</code>
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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,
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<strong class="hl-keyword">const</strong> <strong class="hl-keyword">char</strong> *mod_name)
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{
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<em class="hl-comment">/* (1) 设置 devices 标志为 0，表面这个驱动时给 usb interface 使用的 */</em>
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new_driver->drvwrap.for_devices = <span class="hl-number">0</span>;
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new_driver->drvwrap.driver.name = new_driver->name;
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new_driver->drvwrap.driver.bus = &usb_bus_type;
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new_driver->drvwrap.driver.probe = usb_probe_interface;
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new_driver->drvwrap.driver.remove = usb_unbind_interface;
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new_driver->drvwrap.driver.owner = owner;
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new_driver->drvwrap.driver.mod_name = mod_name;
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new_driver->drvwrap.driver.dev_groups = new_driver->dev_groups;
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spin_lock_init(&new_driver->dynids.lock);
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INIT_LIST_HEAD(&new_driver->dynids.list);
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retval = driver_register(&new_driver->drvwrap.driver);
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}
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</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>
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:<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[] = {
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{ USB_INTERFACE_INFO(USB_INTERFACE_CLASS_HID, USB_INTERFACE_SUBCLASS_BOOT,
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USB_INTERFACE_PROTOCOL_MOUSE) },
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{ } <em class="hl-comment">/* Terminating entry */</em>
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};
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MODULE_DEVICE_TABLE (usb, usb_mouse_id_table);
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<strong class="hl-keyword">static</strong> <strong class="hl-keyword">struct</strong> usb_driver usb_mouse_driver = {
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.name = <span class="hl-string">"usbmouse"</span>,
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.probe = usb_mouse_probe,
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.disconnect = usb_mouse_disconnect,
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.id_table = usb_mouse_id_table,
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};
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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">
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<div class="- topic/p p" data-ofbid="d105671e63__20250121171540">首先根据得到的 endpoint 准备好 urb，创建好 input
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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)
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{
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<strong class="hl-keyword">struct</strong> usb_device *dev = interface_to_usbdev(intf);
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<strong class="hl-keyword">struct</strong> usb_host_interface *interface;
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<strong class="hl-keyword">struct</strong> usb_endpoint_descriptor *endpoint;
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<strong class="hl-keyword">struct</strong> usb_mouse *mouse;
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<strong class="hl-keyword">struct</strong> input_dev *input_dev;
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<strong class="hl-keyword">int</strong> pipe, maxp;
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<strong class="hl-keyword">int</strong> error = -ENOMEM;
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interface = intf->cur_altsetting;
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<strong class="hl-keyword">if</strong> (interface->desc.bNumEndpoints != <span class="hl-number">1</span>)
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<strong class="hl-keyword">return</strong> -ENODEV;
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<em class="hl-comment">/* (1) 得到当前 interface 中的第一个 endpoint，mouse 设备只需一个 endpoint */</em>
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endpoint = &interface->endpoint[<span class="hl-number">0</span>].desc;
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<strong class="hl-keyword">if</strong> (!usb_endpoint_is_int_in(endpoint))
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<strong class="hl-keyword">return</strong> -ENODEV;
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pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
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maxp = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
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mouse = kzalloc(<strong class="hl-keyword">sizeof</strong>(<strong class="hl-keyword">struct</strong> usb_mouse), GFP_KERNEL);
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<em class="hl-comment">/* (2.1) 分配 input device */</em>
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input_dev = input_allocate_device();
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<strong class="hl-keyword">if</strong> (!mouse || !input_dev)
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<strong class="hl-keyword">goto</strong> fail1;
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mouse->data = usb_alloc_coherent(dev, <span class="hl-number">8</span>, GFP_ATOMIC, &mouse->data_dma);
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<strong class="hl-keyword">if</strong> (!mouse->data)
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<strong class="hl-keyword">goto</strong> fail1;
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<em class="hl-comment">/* (3.1) 分配 urb */</em>
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mouse->irq = usb_alloc_urb(<span class="hl-number">0</span>, GFP_KERNEL);
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<strong class="hl-keyword">if</strong> (!mouse->irq)
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<strong class="hl-keyword">goto</strong> fail2;
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mouse->usbdev = dev;
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mouse->dev = input_dev;
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<strong class="hl-keyword">if</strong> (dev->manufacturer)
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strlcpy(mouse->name, dev->manufacturer, <strong class="hl-keyword">sizeof</strong>(mouse->name));
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<strong class="hl-keyword">if</strong> (dev->product) {
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<strong class="hl-keyword">if</strong> (dev->manufacturer)
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strlcat(mouse->name, <span class="hl-string">" "</span>, <strong class="hl-keyword">sizeof</strong>(mouse->name));
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strlcat(mouse->name, dev->product, <strong class="hl-keyword">sizeof</strong>(mouse->name));
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}
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<strong class="hl-keyword">if</strong> (!strlen(mouse->name))
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snprintf(mouse->name, <strong class="hl-keyword">sizeof</strong>(mouse->name),
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<span class="hl-string">"USB HIDBP Mouse %04x:%04x"</span>,
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le16_to_cpu(dev->descriptor.idVendor),
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le16_to_cpu(dev->descriptor.idProduct));
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usb_make_path(dev, mouse->phys, <strong class="hl-keyword">sizeof</strong>(mouse->phys));
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strlcat(mouse->phys, <span class="hl-string">"/input0"</span>, <strong class="hl-keyword">sizeof</strong>(mouse->phys));
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<em class="hl-comment">/* (2.2) 初始化 input device */</em>
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input_dev->name = mouse->name;
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input_dev->phys = mouse->phys;
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usb_to_input_id(dev, &input_dev->id);
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input_dev->dev.parent = &intf->dev;
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input_dev->evbit[<span class="hl-number">0</span>] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
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input_dev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
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BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
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input_dev->relbit[<span class="hl-number">0</span>] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
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input_dev->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) |
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BIT_MASK(BTN_EXTRA);
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input_dev->relbit[<span class="hl-number">0</span>] |= BIT_MASK(REL_WHEEL);
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input_set_drvdata(input_dev, mouse);
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input_dev->open = usb_mouse_open;
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input_dev->close = usb_mouse_close;
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<em class="hl-comment">/* (3.2) 初始化 urb */</em>
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usb_fill_int_urb(mouse->irq, dev, pipe, mouse->data,
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(maxp > <span class="hl-number">8</span> ? <span class="hl-number">8</span> : maxp),
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usb_mouse_irq, mouse, endpoint->bInterval);
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mouse->irq->transfer_dma = mouse->data_dma;
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mouse->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
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<em class="hl-comment">/* (2.3) 注册 input device */</em>
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error = input_register_device(mouse->dev);
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<strong class="hl-keyword">if</strong> (error)
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<strong class="hl-keyword">goto</strong> fail3;
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usb_set_intfdata(intf, mouse);
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<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，开始查询数据 */</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);
|
|||
|
|
}
|
|||
|
|
</pre></div>
|
|||
|
|
</li></ul></div></article></main></div>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
<footer class="navbar navbar-default wh_footer">
|
|||
|
|
<div class=" footer-container mx-auto ">
|
|||
|
|
<title>footer def</title>
|
|||
|
|
<style><!--
|
|||
|
|
|
|||
|
|
.p1 {
|
|||
|
|
font-family: FangZhengShuSong, Times, serif;
|
|||
|
|
}
|
|||
|
|
.p2 {
|
|||
|
|
font-family: Arial, Helvetica, sans-serif;
|
|||
|
|
}
|
|||
|
|
.p3 {
|
|||
|
|
font-family: "Lucida Console", "Courier New", monospace;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
--></style>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<div class="webhelp.fragment.footer">
|
|||
|
|
<p class="p1">Copyright © 2019-2024 广东匠芯创科技有限公司. All rights reserved.</p>
|
|||
|
|
</div><div>
|
|||
|
|
<div class="generation_time">
|
|||
|
|
Update Time: 2025-01-21
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</footer>
|
|||
|
|
|
|||
|
|
<div id="go2top" class="d-print-none">
|
|||
|
|
<span class="oxy-icon oxy-icon-up"></span>
|
|||
|
|
</div>
|
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|
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|
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|
|
<div id="modal_img_large" class="modal">
|
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|
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<span class="close oxy-icon oxy-icon-remove"></span>
|
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|
|
<div id="modal_img_container"></div>
|
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|
|
<div id="caption"></div>
|
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|
|
</div>
|
|||
|
|
|
|||
|
|
|
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|
|
<script src="${pd}/publishing/publishing-styles-AIC-template/js/custom.js" defer="defer"></script>
|
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|
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|
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|
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|
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|
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</body>
|
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</html>
|