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data-tocid="rtp-user-guide-d4445e6822" class="topicref" data-id="rtp-user-guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action rtp-user-guide-d4445e6822-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/rtp/rtp_user_guide.html" id="rtp-user-guide-d4445e6822-link">RTP 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="spi-d4445e6962" class="topicref" data-id="spi" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action spi-d4445e6962-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/spi/spi_user_guide.html" id="spi-d4445e6962-link">SPI 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d4445e7075" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d4445e7075-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/psadc/psadc_user_guide.html" id="id-d4445e7075-link">PSADC 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="uart_user_guide-d4445e7215" class="topicref" data-id="uart_user_guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action uart_user_guide-d4445e7215-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/uart/uart_user_guide.html" id="uart_user_guide-d4445e7215-link">UART 使用指南</a></div></div></li><li role="treeitem" aria-expanded="true"><div data-tocid="usb_user_guide-d4445e7299" class="topicref" data-id="usb_user_guide" data-state="expanded"><span role="button" tabindex="0" aria-labelledby="button-collapse-action usb_user_guide-d4445e7299-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb_user_guide.html" id="usb_user_guide-d4445e7299-link">USB 使用指南</a></div></div><ul role="group" class="navbar-nav nav-list"><li role="treeitem" aria-expanded="false"><div data-tocid="usb_configuration-d4445e7313" class="topicref" data-id="usb_configuration" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_configuration-d4445e7313-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb_config.html" id="usb_configuration-d4445e7313-link">USB 配置</a></div></div></li><li role="treeitem"><div data-tocid="usb_debug_guide-d4445e7369" class="topicref" data-id="usb_debug_guide" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-debug_guide.html" id="usb_debug_guide-d4445e7369-link">调试指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="usb_test_guide-d4445e7383" class="topicref" data-id="usb_test_guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_test_guide-d4445e7383-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-test_guide.html" id="usb_test_guide-d4445e7383-link">测试指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="usb_design_intro-d4445e7468" class="topicref" data-id="usb_design_intro" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_design_intro-d4445e7468-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-design_intro.html" id="usb_design_intro-d4445e7468-link">设计说明</a></div></div></li><li role="treeitem" aria-expanded="true"><div data-tocid="usb_host_subsystem_code_structure-d4445e7594" class="topicref" data-id="usb_host_subsystem_code_structure" data-state="expanded"><span role="button" tabindex="0" aria-labelledby="button-collapse-action usb_host_subsystem_code_structure-d4445e7594-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-host_subsystem_code_structure.html" id="usb_host_subsystem_code_structure-d4445e7594-link">USB Host 子系统代码架构</a></div></div><ul role="group" class="navbar-nav nav-list"><li role="treeitem"><div data-tocid="usb_host_core-d4445e7608" class="topicref" data-id="usb_host_core" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-host-core.html" id="usb_host_core-d4445e7608-link">USB Core</a></div></div></li><li role="treeitem"><div data-tocid="usb_host_device_layer-d4445e7622" class="topicref" data-id="usb_host_device_layer" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-host-device_layer.html" id="usb_host_device_layer-d4445e7622-link">USB Device Layer</a></div></div></li><li role="treeitem" aria-expanded="true"><div data-tocid="usb_host_interface_layer-d4445e7636" class="topicref" data-id="usb_host_interface_layer" data-state="expanded"><span role="button" tabindex="0" aria-labelledby="button-collapse-action usb_host_interface_layer-d4445e7636-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-host-interface_layer.html" id="usb_host_interface_layer-d4445e7636-link">USB Interface Layer</a></div></div><ul role="group" class="navbar-nav nav-list"><li role="treeitem"><div data-tocid="usb_host_interface_device_struct_usb_interface-d4445e7650" class="topicref" data-id="usb_host_interface_device_struct_usb_interface" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-host-interface-device_struct_usb_interface.html" id="usb_host_interface_device_struct_usb_interface-d4445e7650-link">Device (struct usb_interface)</a></div></div></li><li role="treeitem" class="active"><div data-tocid="usb_host_interface_driver_struct_usb_driver-d4445e7664" class="topicref" data-id="usb_host_interface_driver_struct_usb_driver" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-host-interface-driver_struct_usb_driver.html" id="usb_host_interface_driver_struct_usb_driver-d4445e7664-link">Driver (struct usb_driver)</a></div></div></li><li role="treeitem"><div data-tocid="usb_host_interface_usb_hub_driver-d4445e7678" class="topicref" data-id="usb_host_interface_usb_hub_driver" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-host-interface-usb_hub_driver.html" id="usb_host_interface_usb_hub_driver-d4445e7678-link">USB Hub Driver</a></div></div></li><li role="treeitem"><div data-tocid="usb_host_interface_bus_usb_bus_type-d4445e7692" class="topicref" data-id="usb_host_interface_bus_usb_bus_type" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-host-interface-bus_usb_bus_type.html" id="usb_host_interface_bus_usb_bus_type-d4445e7692-link">BUS (usb_bus_type)</a></div></div></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="usb_host_controller_layer-d4445e7706" class="topicref" data-id="usb_host_controller_layer" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_host_controller_layer-d4445e7706-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-host-controller_layer.html" id="usb_host_controller_layer-d4445e7706-link">USB Host Controller Layer</a></div></div></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="usb_device_subsystem_code_structure-d4445e7762" class="topicref" data-id="usb_device_subsystem_code_structure" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_device_subsystem_code_structure-d4445e7762-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-device_subsystem_code_structure.html" id="usb_device_subsystem_code_structure-d4445e7762-link">USB Device 子系统代码架构</a></div></div></li><li role="treeitem"><div data-tocid="usb_common_issues-d4445e7930" class="topicref" data-id="usb_common_issues" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb_faq.html" id="usb_common_issues-d4445e7930-link">常见问题</a></div></div></li></ul></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-safety-d4445e7944" class="topicref" data-id="chapter-safety" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-safety-d4445e7944-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-safety-sdk.html" id="chapter-safety-d4445e7944-link">安全</a><div class="wh-tooltip"><p class="shortdesc">SPI ENC、CE、eFuse 等安全模块的介绍和使用说明。</p></div></div></div></li></ul></li></ul></div>
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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" title="Edit this document" 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">15 Jan 2024</div><div style="color: gray;">
|
||
Read time: 6 minute(s)
|
||
</div>
|
||
<div class="- topic/body concept/conbody body conbody">
|
||
<p class="- topic/p p" data-ofbid="d118010e33__20250123155210"><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="d118010e50__20250123155210"><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"><code><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)
|
||
{
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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>
|
||
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);
|
||
|
||
}
|
||
</code></pre></div>
|
||
<div class="- topic/p p" data-ofbid="d118010e63__20250123155210">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"><code><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);</code></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="d118010e76__20250123155210">
|
||
<div class="- topic/p p" data-ofbid="d118010e78__20250123155210">首先根据得到的 endpoint 准备好 urb，创建好 input
|
||
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"><code><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，mouse 设备只需一个 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;
|
||
}
|
||
</code></pre></div>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d118010e84__20250123155210">
|
||
<div class="- topic/p p" data-ofbid="d118010e86__20250123155210">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"><code><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>;
|
||
}
|
||
</code></pre></div>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d118010e92__20250123155210">
|
||
<div class="- topic/p p" data-ofbid="d118010e94__20250123155210">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"><code><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);
|
||
}
|
||
</code></pre></div>
|
||
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