OK6410 想释放GPIO-KEYS 占有的中断号

dannylsl

Linux 2.6.36.2
Ubuntu 10.04
我想编写GPIO-KEYS的中断驱动程序，由于板子上的系统已经使用了相关中断号
所以只有释放周才能使用
使用 free_irq(IRQ_EINT(0),NULL) 来释放中断
但是cat /proc/kmsg 有如下提示

1. <4>------------[ cut here ]------------
   
2. <4>WARNING: at kernel/irq/manage.c:899 __free_irq+0x9c/0x1ac()
   
3. <4>[b]Trying to free already-free IRQ 101[/b]
   
4. <4>Modules linked in: button2(+) [last unloaded: button2]
   
5. <4>[<c0037a8c>] (unwind_backtrace+0x0/0xfc) from [<c04ac5f8>] (dump_stack+0x18/0x1c)
   
6. <4>[<c04ac5f8>] (dump_stack+0x18/0x1c) from [<c004c54c>] (warn_slowpath_common+0x54/0x6c)
   
7. <4>[<c004c54c>] (warn_slowpath_common+0x54/0x6c) from [<c004c608>] (warn_slowpath_fmt+0x38/0x40)
   
8. <4>[<c004c608>] (warn_slowpath_fmt+0x38/0x40) from [<c0082dbc>] (__free_irq+0x9c/0x1ac)
   
9. <4>[<c0082dbc>] (__free_irq+0x9c/0x1ac) from [<c0082f10>] (free_irq+0x44/0x64)
   
10. <4>[<c0082f10>] (free_irq+0x44/0x64) from [<bf006054>] (button2_init+0x34/0x58 [button2])
    
11. <4>[<bf006054>] (button2_init+0x34/0x58 [button2]) from [<c0031378>] (do_one_initcall+0x38/0x1ac)
    
12. <4>[<c0031378>] (do_one_initcall+0x38/0x1ac) from [<c007e894>] (sys_init_module+0xb8/0x1cc)
    
13. <4>[<c007e894>] (sys_init_module+0xb8/0x1cc) from [<c0031a20>] (ret_fast_syscall+0x0/0x30)
    
14. <4>---[ end trace 69130b5f71451ee3 ]---
    
15. <4>------------[ cut here ]------------
    
16. <4>WARNING: at kernel/irq/manage.c:899 __free_irq+0x9c/0x1ac()
    
17. <4>[b]Trying to free already-free IRQ 102[/b]
    
18. <4>Modules linked in: button2(+) [last unloaded: button2]
    
19. <4>[<c0037a8c>] (unwind_backtrace+0x0/0xfc) from [<c04ac5f8>] (dump_stack+0x18/0x1c)
    
20. <4>[<c04ac5f8>] (dump_stack+0x18/0x1c) from [<c004c54c>] (warn_slowpath_common+0x54/0x6c)
    
21. <4>[<c004c54c>] (warn_slowpath_common+0x54/0x6c) from [<c004c608>] (warn_slowpath_fmt+0x38/0x40)
    
22. <4>[<c004c608>] (warn_slowpath_fmt+0x38/0x40) from [<c0082dbc>] (__free_irq+0x9c/0x1ac)
    
23. <4>[<c0082dbc>] (__free_irq+0x9c/0x1ac) from [<c0082f10>] (free_irq+0x44/0x64)
    
24. <4>[<c0082f10>] (free_irq+0x44/0x64) from [<bf006054>] (button2_init+0x34/0x58 [button2])
    
25. <4>[<bf006054>] (button2_init+0x34/0x58 [button2]) from [<c0031378>] (do_one_initcall+0x38/0x1ac)
    
26. <4>[<c0031378>] (do_one_initcall+0x38/0x1ac) from [<c007e894>] (sys_init_module+0xb8/0x1cc)
    
27. <4>[<c007e894>] (sys_init_module+0xb8/0x1cc) from [<c0031a20>] (ret_fast_syscall+0x0/0x30)
    
28. <4>---[ end trace 69130b5f71451ee4 ]---
    
29. <4>------------[ cut here ]------------
    
30. <4>WARNING: at kernel/irq/manage.c:899 __free_irq+0x9c/0x1ac()
    
31. <4>[b]Trying to free already-free IRQ 103[/b]
    
32. <4>Modules linked in: button2(+) [last unloaded: button2]
    
33. <4>[<c0037a8c>] (unwind_backtrace+0x0/0xfc) from [<c04ac5f8>] (dump_stack+0x18/0x1c)
    
34. <4>[<c04ac5f8>] (dump_stack+0x18/0x1c) from [<c004c54c>] (warn_slowpath_common+0x54/0x6c)
    
35. <4>[<c004c54c>] (warn_slowpath_common+0x54/0x6c) from [<c004c608>] (warn_slowpath_fmt+0x38/0x40)
    
36. <4>[<c004c608>] (warn_slowpath_fmt+0x38/0x40) from [<c0082dbc>] (__free_irq+0x9c/0x1ac)
    
37. <4>[<c0082dbc>] (__free_irq+0x9c/0x1ac) from [<c0082f10>] (free_irq+0x44/0x64)
    
38. <4>[<c0082f10>] (free_irq+0x44/0x64) from [<bf006054>] (button2_init+0x34/0x58 [button2])
    
39. <4>[<bf006054>] (button2_init+0x34/0x58 [button2]) from [<c0031378>] (do_one_initcall+0x38/0x1ac)
    
40. <4>[<c0031378>] (do_one_initcall+0x38/0x1ac) from [<c007e894>] (sys_init_module+0xb8/0x1cc)
    
41. <4>[<c007e894>] (sys_init_module+0xb8/0x1cc) from [<c0031a20>] (ret_fast_syscall+0x0/0x30)
    
42. <4>---[ end trace 69130b5f71451ee5 ]---
    
43. <4>------------[ cut here ]------------
    
44. <4>WARNING: at kernel/irq/manage.c:899 __free_irq+0x9c/0x1ac()
    
45. <4>[b]Trying to free already-free IRQ 104[/b]
    
46. <4>Modules linked in: button2(+) [last unloaded: button2]
    
47. <4>[<c0037a8c>] (unwind_backtrace+0x0/0xfc) from [<c04ac5f8>] (dump_stack+0x18/0x1c)
    
48. <4>[<c04ac5f8>] (dump_stack+0x18/0x1c) from [<c004c54c>] (warn_slowpath_common+0x54/0x6c)
    
49. <4>[<c004c54c>] (warn_slowpath_common+0x54/0x6c) from [<c004c608>] (warn_slowpath_fmt+0x38/0x40)
    
50. <4>[<c004c608>] (warn_slowpath_fmt+0x38/0x40) from [<c0082dbc>] (__free_irq+0x9c/0x1ac)
    
51. <4>[<c0082dbc>] (__free_irq+0x9c/0x1ac) from [<c0082f10>] (free_irq+0x44/0x64)
    
52. <4>[<c0082f10>] (free_irq+0x44/0x64) from [<bf006054>] (button2_init+0x34/0x58 [button2])
    
53. <4>[<bf006054>] (button2_init+0x34/0x58 [button2]) from [<c0031378>] (do_one_initcall+0x38/0x1ac)
    
54. <4>[<c0031378>] (do_one_initcall+0x38/0x1ac) from [<c007e894>] (sys_init_module+0xb8/0x1cc)
    
55. <4>[<c007e894>] (sys_init_module+0xb8/0x1cc) from [<c0031a20>] (ret_fast_syscall+0x0/0x30)
    
56. <4>---[ end trace 69130b5f71451ee6 ]---
    
57. <4>------------[ cut here ]------------
    
58. <4>WARNING: at kernel/irq/manage.c:899 __free_irq+0x9c/0x1ac()
    
59. <4>[b]Trying to free already-free IRQ 105[/b]
    
60. <4>Modules linked in: button2(+) [last unloaded: button2]
    
61. <4>[<c0037a8c>] (unwind_backtrace+0x0/0xfc) from [<c04ac5f8>] (dump_stack+0x18/0x1c)
    
62. <4>[<c04ac5f8>] (dump_stack+0x18/0x1c) from [<c004c54c>] (warn_slowpath_common+0x54/0x6c)
    
63. <4>[<c004c54c>] (warn_slowpath_common+0x54/0x6c) from [<c004c608>] (warn_slowpath_fmt+0x38/0x40)
    
64. <4>[<c004c608>] (warn_slowpath_fmt+0x38/0x40) from [<c0082dbc>] (__free_irq+0x9c/0x1ac)
    
65. <4>[<c0082dbc>] (__free_irq+0x9c/0x1ac) from [<c0082f10>] (free_irq+0x44/0x64)
    
66. <4>[<c0082f10>] (free_irq+0x44/0x64) from [<bf006054>] (button2_init+0x34/0x58 [button2])
    
67. <4>[<bf006054>] (button2_init+0x34/0x58 [button2]) from [<c0031378>] (do_one_initcall+0x38/0x1ac)
    
68. <4>[<c0031378>] (do_one_initcall+0x38/0x1ac) from [<c007e894>] (sys_init_module+0xb8/0x1cc)
    
69. <4>[<c007e894>] (sys_init_module+0xb8/0x1cc) from [<c0031a20>] (ret_fast_syscall+0x0/0x30)
    
70. <4>---[ end trace 69130b5f71451ee7 ]---
    
71. <4>------------[ cut here ]------------
    
72. <4>WARNING: at kernel/irq/manage.c:899 __free_irq+0x9c/0x1ac()
    
73. <4>[b]Trying to free already-free IRQ 106[/b]
    
74. <4>Modules linked in: button2(+) [last unloaded: button2]
    
75. <4>[<c0037a8c>] (unwind_backtrace+0x0/0xfc) from [<c04ac5f8>] (dump_stack+0x18/0x1c)
    
76. <4>[<c04ac5f8>] (dump_stack+0x18/0x1c) from [<c004c54c>] (warn_slowpath_common+0x54/0x6c)
    
77. <4>[<c004c54c>] (warn_slowpath_common+0x54/0x6c) from [<c004c608>] (warn_slowpath_fmt+0x38/0x40)
    
78. <4>[<c004c608>] (warn_slowpath_fmt+0x38/0x40) from [<c0082dbc>] (__free_irq+0x9c/0x1ac)
    
79. <4>[<c0082dbc>] (__free_irq+0x9c/0x1ac) from [<c0082f10>] (free_irq+0x44/0x64)
    
80. <4>[<c0082f10>] (free_irq+0x44/0x64) from [<bf006054>] (button2_init+0x34/0x58 [button2])
    
81. <4>[<bf006054>] (button2_init+0x34/0x58 [button2]) from [<c0031378>] (do_one_initcall+0x38/0x1ac)
    
82. <4>[<c0031378>] (do_one_initcall+0x38/0x1ac) from [<c007e894>] (sys_init_module+0xb8/0x1cc)
    
83. <4>[<c007e894>] (sys_init_module+0xb8/0x1cc) from [<c0031a20>] (ret_fast_syscall+0x0/0x30)
    
84. <4>---[ end trace 69130b5f71451ee8 ]---
    

复制代码

查看 cat/proc/interrupts 原来的中断BUTTON依旧在，请教解决方法，或者求教系统自带的GPIO-KEYS的驱动的调用方法
顺便告诉一下 GPIO-KEYS驱动的示例程序和驱动程序的位置,懒得找的话说个文件名也行....

nomaze

我也是这个问题啊。。。在考虑用disable_irq和enable_irq来解决，不知道可不可以

nomaze

这个问题有人能回答吗？飞凌的工作人员呢

nomaze

经过不懈的努力，总算是被我找出解决方法了，这里无法注册中断的原因，当然是中断线已被占用，而去查看free_irq的代码(在kernel/irq/manage.c中)，可以发现，出现这个Trying to free already-free IRQ 101 告警的原因是  存在该中断号对应的中断描述符desc ，而相印的中断服务程序却不存在。  说明有驱动程序占用了该中断号。 因而，我们要去掉这个驱动程序，方法：make menuconfig->Device Drivers->input device support->Key Boards->GPIO Buttons 去掉前面的*，即不选该项即可。
重新编译内核，ok

飞凌-develop

楼上朋友的方法是配置Linux内核时去掉中断，也可以采用中断共享的方式来使用相同的中断源。

飞凌-develop

楼上朋友的方法是配置Linux内核时去掉设备占用的中断，也可以采用中断共享的方式来使用相同的中断源，比如ADC驱动和触摸屏驱动都使用了相同的ADC中断号，楼主可以参考一下这两个设备的驱动程序。

nomaze

回复 7# 飞凌-develop


    我试过共享的方式，没有成功，一直返回-EBUSY，不知道应该是怎么样一个形式来注册中断号，我采用的是request_irq，然后flags是IRQF_SHARED，第五个参数也设置了，教我一下