如何使 USB 设备支持多点触控？

发布于 2024-11-24 16:52:57 字数 1399 浏览 3 评论 0原文

我正在为 Linux 制作第一个 USB 设备驱动程序，并且正在尝试连接触摸屏设备。

我在Win7中尝试过这个设备，使用Win7的默认触摸板驱动程序。使用线路监视器/读取器，我能够通过多点触控启用获取原始数据。为了示例，我们假设多点触摸数据标头是 [0x8301] 和 [0x8701] 分别用于第一次和第二次触摸。

现在，使用多点触摸禁用，原始数据标头将是[0x8101]

现在，使用我为Linux制作的驱动程序，我只能让它输出[0x8101 ]，这是一个一键式数据标头。

所以我猜测在初始化代码的这一部分中，我必须对设备说它是多点触控设备。或者我可能初始化错误。

    struct input_dev *input_dev;
input_dev = input_allocate_device();
input_dev->name = usb_mtouch->name;
input_dev->phys = usb_mtouch->phys;
usb_to_input_id(usb_mtouch->udev, &input_dev->id);
input_dev->dev.parent = &interface->dev;

input_set_drvdata(input_dev, usb_mtouch);

input_dev->open = mtouchdrv_open;
input_dev->close = mtouchdrv_close;

input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_PEN) |
    BIT_MASK(BTN_TOUCH) | BIT_MASK(BTN_STYLUS);
input_set_abs_params(input_dev, ABS_X, usb_mtouch->x_min, usb_mtouch->x_max, 0, 0);
input_set_abs_params(input_dev, ABS_Y, usb_mtouch->y_min, usb_mtouch->y_max, 0, 0);
input_set_abs_params(input_dev, ABS_PRESSURE, 0, usb_mtouch->press_max, 0, 0);
input_dev->absbit[BIT_WORD(ABS_MISC)] |= BIT_MASK(ABS_MISC);

另外，我使用的是 Linux 2.6.24。

谢谢！

名泽

原文

I'm making my first USB device driver for Linux, and I'm trying to connect a touch panel device.

I have tried this device in Win7, using Win7's default touch panel driver.
Using a line monitor/reader, I was able to get the raw data with multi-touch ENABLED.
Let's just say for sample's sake a multi-touch data header is [0x8301] and [0x8701]
for the first and second touch respectively.

Now with multi-touch DISABLED the raw data header would be [0x8101]

Now with the driver I made for Linux, I can only get it to output [0x8101], which is a one touch data header.

So I'm guessing somewhere in this part of the initialization code, I have to say to the device it is a multi-touch device. Or I'm probably initializing it wrongly.

    struct input_dev *input_dev;
input_dev = input_allocate_device();
input_dev->name = usb_mtouch->name;
input_dev->phys = usb_mtouch->phys;
usb_to_input_id(usb_mtouch->udev, &input_dev->id);
input_dev->dev.parent = &interface->dev;

input_set_drvdata(input_dev, usb_mtouch);

input_dev->open = mtouchdrv_open;
input_dev->close = mtouchdrv_close;

input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_PEN) |
    BIT_MASK(BTN_TOUCH) | BIT_MASK(BTN_STYLUS);
input_set_abs_params(input_dev, ABS_X, usb_mtouch->x_min, usb_mtouch->x_max, 0, 0);
input_set_abs_params(input_dev, ABS_Y, usb_mtouch->y_min, usb_mtouch->y_max, 0, 0);
input_set_abs_params(input_dev, ABS_PRESSURE, 0, usb_mtouch->press_max, 0, 0);
input_dev->absbit[BIT_WORD(ABS_MISC)] |= BIT_MASK(ABS_MISC);

Also, I am using Linux 2.6.24.

Thanks!

Naze

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青瓷清茶倾城歌 2024-12-01 16:52:57

我得到了它。您必须向设备发送控制消息。

int usb_control_msg(struct usb_device *dev, unsigned int pipe, __u8 request,
                     __u8 requesttype, __u16 value, __u16 index, void *data,
                     __u16 size, int timeout)

大多数设备默认启用一键式。因此，向设备发送消息就可以了。

棘手的部分是发送什么消息。因为Win7可以做到一键或多点触摸。我所做的只是比较两者的初始化序列。并在 Linux 上应用“丢失”的消息。

I got it. You would have to send a control message to the device.

int usb_control_msg(struct usb_device *dev, unsigned int pipe, __u8 request,
                     __u8 requesttype, __u16 value, __u16 index, void *data,
                     __u16 size, int timeout)

Most devices are one-touched enabled by default. So sending a message to the device will do the trick.

The tricky part is what message to send. Since Win7 can make it one-touch or multi-touch. What I did was just compare the the Initialization Sequence on both. And apply the "missing" messages on Linux.

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