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urb_list; //URB for this endpoint, maintained by the USB core void *hcpriv; struct Ep_device *ep_dev; / * for SYSFS info * / unsigned Char*extra; /* Extra descriptors * / int Extralen; int enabled; }; an int usb_hcd_link_urb_to_ep (struct USB_HCD *hcd, struct URB *urb) is called to add this urb to urb_ when invoking the USB device driver call Usb_submit_urb commit URB Request List on th
From the Protocol to the Protocol (above) In structusb_driver, the prototype of. Probe and. Disconnect is as follows: 836 int (* probe) (struct usb_interface * INTF, 837 const struct usb_device_id * ID ); 838 839 void (* disconnect) (struct usb_interface * INTF ); Let's take a look at the parameter structusb_device_id, Which is needless to say. As we have already introduced, where does struct usb_interface come from? Let's start with struct usb_device. We know that each device corresponds to a s
tool for viewing all the partition tables in your system, including all USB devices, using root privileges to execute the following commands:[[emailprotected] ~]# fdisk-ldisk/dev/sda:21.5 GB, 21474836480 bytes, 41943040 sectorsunits = sectors of 1 * 512 = Bytessector Size (logical/physical): bytes/512 bytesi/o size (minimum/optimal): bytes/512 bytesdisk Labe L type:dosdisk identifier:0x0006c7ae Device Boot Start End Blocks Id system/dev/sda1 * 2 048
: 0x00000000 Device boot start end blocks ID system/Dev/sdc1 1 970 124115 B w95 FAT32Partition 1 has different physical/logical beginnings (non-Linux ?) :Phys = (0, 2, 0) logical = (0, 2, 27) From the last few lines, we can see that the U disk is mounted under/dev/sdc1. Remember this mount point, which varies according to the Linux system. Step 2: mount the USB
the right of the equal sign are called. If struct us_data is the main character in usb mass storage, struct urb will become the main character in the whole USB subsystem without dispute. All USB drivers in Linux must also use urb. So what exactly does urb look like? You can find it in include/
In 1991, one introduced the concept of pipelines in Linux and used pipelines in many places, such as file systems and device drivers. So we can see that there are various pipelines in Linux. But the same thing is that all pipelines are used to transmit things, but some pipelines transmit real material while some pipelines transmit data. The pipe we see in the USB
Install a Linux system to a USB flash drive or a USB flash drive for a linux System Step 1: First insert the usb flash drive to the usb interface of the Computer Host (it is recommended to insert the
the layman. The USB device has a configuration, which we mentioned earlier, and there is another setting (setting ). A little strange, aren't these two words the same thing? Let's take our most familiar mobile phone for example. If you don't talk about the configuration, you just need to set it. Various configurations of a mobile phone may have been determined. For example, the vibration or ringtones are determined, and various functions are determin
, structusb_sg_request actually represents a scattergather request. From the perspective of our non-USB core layer, the usage of these two structs is the same. For each urb request, all we do is apply for a struct variable or request a pointer, and then apply for memory. The second step is to submit urb, that is, call usb_submit_urb ().Core will help us solve the problem. Every module in Linux provides serv
Install ubuntu on a USB flash drive and start Linux from the USB flash drive. If we install the Linux system directly on our hard disk, the GRUB of Linux will overwrite the boot guide of window. It is not convenient to carry. So I want to install a ubuntu system on a
This story uses kernel code 2.6.22. In the Linux kernel code directory, all the code related to the device driver is under the drivers/Directory. Using the ls command in this directory, you can see many subdirectories: lfg1: /usr/src/linux-2.6.22/drivers # lsKconfi... This story uses kernel code 2.6.22. In the Linux kernel code directory, all the code related to
Udisk boot installation linux( not the installation of linux5111.diskgenius.exe on the udisk can meet my needs. I tried it and it is still very useful. The DiskGenius software interface is used to create a usb hdd boot disk. this software is used to create a usb hdd boot disk. at this time, the USB flash disk can be st
unsigned int delay_use = 5; 111 module_param (delay_use, uint, s_irugo | s_iwusr ); 112 module_parm_desc (delay_use, "seconds todelay before using a new device "); Set delay_use to 5, while module_param is a macro provided by Linux kernel 2.6, so that delay_use can be set when the module is loaded. (If this parameter is not set, the value 5 indicates that a new device is waiting for a delay of 5 seconds .) Why latency? When the inserted
-storage: devicescan complete \ n "); 936 937/* shocould we unbind if no devices weredetected? */ 938} 939 940 scsi_host_put (us_to_host (us )); 941 complete_and_exit ( threads_gone, 0 ); 942} Row 3, where does delay_use come from? In the same file, a static variable is defined at the beginning: 110 static unsigned int delay_use = 5; 111 module_param (delay_use, uint, S_IRUGO | S_IWUSR ); 112 MODULE_PARM_DESC (delay_use, "seconds todelay before using a new device "); Set delay_use to
Installation Configuration minicom-------------------------------------------------- # lsmod | grep usbserial(If you use the serial port directly, but do not use USB to switch serial device, this step can be skipped) If there is usbserial, the system supports USB to the serial port. Install minicom (fedora comes with minicom, this step can be skipped) apt-get Install minicom apt-get Install Lrzsz Confi
Capture the USB flash drive as an iso file in linux and copy the USB flash drive in batches using iso Sometimes we need to capture the entire USB flash drive as an iso file. This iso can be used to burn the disc. Of course, we can also use the software to burn it back to another US
We followed storage_probe () almost completely, and it seems that everything is about to end, but do you think you haven't understood how the device works so far? USB flash disks, not just USB devices or disks, must comply with the USB massstorage protocol and... We followed storage_probe () almost completely, and it seems that everything is about to end, but do
impossible for you to pull it out. hot swapping is a major feature of USB devices. Row 3 and host are also locks, so we can check the lock at the end. Lines 326 to 330 are used to determine whether another flag has been set. the meaning of the flag US_FLDX_TIMED_OUT is also as literal, that is, timeout. The concept of timeout is everywhere in the computer world. However, for this flag, the function for setting it is command_abort. This function is
interface descriptor. Row 3, struct us_unusual_dev, is the first occurrence of this struct, which is defined in drivers/USB/storage/USB. h: 61 struct us_unusual_dev { 62 constchar * vendorname; 63 const char * productname; 64 _ u8 useprotocol; 65 _ u8 usetransport; 66 int (* initfunction) (struct us_data *); 67 }; The find_unusual () function on the right of "=" is defined in drivers/
module_exit (usb_stor_exit ); In fact, module_init/module_exit is just a macro. generally, to show your own personality, the module writer will name their own initialization function and deregister function. for example, module_init (usb_stor_init) and module_exit (usb_stor_exit) is actually telling the world that the real functions are usb_stor_init and usb_stor_exit. This kind of trick is not uncommon in Linux kernel code, so you don't have to worr
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