Linux的USB打印機驅動程序想念DEVTYPE？

Question

這是一個打印機：

add@/devices/pci0000:00/0000:00:1d.7/usb1/1-2/1-2:1.0/usb/lp0 
ACTION=add 
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb1/1-2/1-2:1.0/usb/lp0 
SUBSYSTEM=usb 
MAJOR=180 
MINOR=0 
DEVNAME=usb/lp0 
SEQNUM=1858 
E=7/1/2 
MODALIAS=usb:v03F0pB511d0100dc00dsc00dp00ic07isc01ip02 
SEQNUM=1856 

received 276 bytes 

爲什麼沒有DEVTYPE？

其他設備有它。

我需要它！

Answer 1

自己修復。

diff --git a/kernel/drivers/usb/class/usblp.c b/kernel/drivers/usb/cl 
index 9eca405..b528437 100755 
--- a/kernel/drivers/usb/class/usblp.c 
+++ b/kernel/drivers/usb/class/usblp.c 
@@ -1046,8 +1046,13 @@ static const struct file_operations usblp_fops 
     .llseek =  noop_llseek, 
}; 

+static struct device_type printer_type = { 
+  .name = "printer", 
+}; 
+ 
static char *usblp_devnode(struct device *dev, mode_t *mode) 
{ 
+  dev->type=&printer_type; 
     return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); 
}