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标题: linux的PCI驱动的疑问 [打印本页]

作者: wucongdonglai 时间: 2011-01-13 16:48
标题: linux的PCI驱动的疑问
最近学习linux的PCI驱动开发，打算想试着针对凌华的采集卡写驱动，今天只写了一个框架，编译运行，遇到问题了，在注册和探测部分的源码如下：
//driver's member function prode
static int __devinit adl_probe(struct pci_dev *pci_dev,const struct pci_device_id *pco_id)
{
  int i; //i is used for counting
  printk(KERN_ALERT "adlink modules is probing!\n");
  //struct pci_dev *adl_dev=NULL;
  if(pci_enable_device(pci_dev))
  {
return -EIO;
  };
  pci_set_master(pci_dev);
// #define BASE_REG_NUM 6
  unsigned long mmio_start[BASE_REG_NUM];
  for(i=0;i<BASE_REG_NUM;i++)
  {
  mmio_start[i]=pci_resource_start(pci_dev,i);
  printk(KERN_ALERT "the adress of the base register %i is %l\n",i,mmio_start[i]);
  }
  return 0;
}
//其实这我就想看看6个基地址寄存器的地址

//the detail of the driver module
static struct pci_driver adl_pci_driver= {
  .name = MODULE_NAME,
  .id_table = adl_pci_tbl,
  .probe = adl_probe,
  .remove = adl_remove,
};
//register adlink driver module
static int __init adl_init_module(void)
{
  printk(KERN_ALERT "adlink modules is inited!\n");
  return pci_register_driver(&adl_pci_driver);
}

//remove adlink driver module
static void __exit adl_exit_module(void)
{
  printk(KERN_ALERT "adlink modules is exited!\n");
  pci_unregister_driver(&adl_pci_driver);
}

module_init(adl_init_module);
module_exit(adl_exit_module);
编译运行，能够在/var/log/message 中看到
Jan 13 16:31:54 localhost kernel: adlink modules is inited!
Jan 13 16:46:52 localhost kernel: adlink modules is exited!
但是没有调用probe函数，不然应该有其他输出的！这是为什么呢？哪错了啊

作者: goldenfort 时间: 2011-01-13 17:00
调用 probe 函数，需要驱动支持的 device id 和 vendor id 与设备里读出来的一样。

先看下是否一致

作者: wmmy2008 时间: 2011-01-13 17:25
公母没配对.

作者: wucongdonglai 时间: 2011-01-14 09:16
回复 2# goldenfort

源码如下：
#include <linux/pci.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/config.h>
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <asm/irq.h>
#include <linux/compiler.h>
#include <linux/completion.h>
#include <linux/mii.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Wu Donglei");

#define MODULE_NAME "adlink"
#define ADLINK_VENDOR_ID  0x1022
#define ADLINK_DEVICE_ID  0x2000

static struct pci_device_id adl_pci_tbl [] = {
{ADLINK_VENDOR_ID,ADLINK_DEVICE_ID,PCI_ANY_ID,PCI_ANY_ID,0,0,0},
{0,}
};
MODULE_DEVICCE_TABLE(pci,adl_pci_tbl);

//driver's member function prode
static int __devinit adl_probe(struct pci_dev *pci_dev,const struct
pci_device_id *pco_id)
{
u16 vendor,device;
printk(KERN_ALERT "adlink modules is probing!\n");
pci_read_config_word(pci_dev,0,&vendor);
pci_read_config_word(pci_dev,2,&device);
printk(KERN_INFO "%x:%x\n",vendor,device);
return 0;
}

//driver's member function remove
static int __devexit adl_remove(struct pci_dev *pci_dev)
{
printk(KERN_ALERT "adlink modules is removed!\n");
return 0;
}

//the detail of the driver module
static struct pci_driver adl_pci_driver= {
.name = MODULE_NAME,
.id_table = adl_pci_tbl,
.probe = adl_probe,
.remove = adl_remove,
};
//register adlink driver module
static int __init adl_init_module(void)
{
printk(KERN_ALERT "adlink modules is inited!\n");
return pci_register_driver(&adl_pci_driver);
}

//remove adlink driver module
static void __exit adl_exit_module(void)
{
printk(KERN_ALERT "adlink modules is exited!\n");
pci_unregister_driver(&adl_pci_driver);
}

module_init(adl_init_module);
module_exit(adl_exit_module);

在我insmod adlink.ko后，再卸载在/var/log/message中有输出：
Jan 13 17:01:51 localhost kernel: adlink modules is inited!
Jan 13 17:02:42 localhost kernel: adlink modules is exited!
但是为什么就没有调用probe函数呢？
我lspci -x：有这个设备：
02:01.0 Ethernet controller: Advanced Micro Devices [AMD] 79c970
[PCnet32 LANCE] (rev 10)
00: 22 10 00 20 07 00 80 02 10 00 00 02 00 40 00 00
10: 01 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 22 10 00 20
30: 00 00 00 00 00 00 00 00 00 00 00 00 05 01 06 ff
从这里面来看：
#define ADLINK_VENDOR_ID  0x1022
#define ADLINK_DEVICE_ID  0x2000
应该是一致的吧？

作者: goldenfort 时间: 2011-01-14 16:43
本帖最后由 goldenfort 于 2011-01-14 16:44 编辑

回复 4# wucongdonglai

http://lxr.linux.no/#linux+v2.6.37/drivers/net/pcnet32.c

这里有这个网卡的驱动源程序，比较下就能知道原因了

它的是这样写的

static DEFINE_PCI_DEVICE_TABLE(pcnet32_pci_tbl) = {
  65       { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LANCE_HOME), },
  66       { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LANCE), },
  67
  68       /*
  69       * Adapters that were sold with IBM's RS/6000 or pSeries hardware have
  70       * the incorrect vendor id.
  71       */
  72       { PCI_DEVICE(PCI_VENDOR_ID_TRIDENT, PCI_DEVICE_ID_AMD_LANCE),
  73       .class = (PCI_CLASS_NETWORK_ETHERNET <<

, .class_mask = 0xffff00, },
74
75 { } /* terminate list */

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