{"id":1521,"date":"2010-10-02T21:45:59","date_gmt":"2010-10-02T13:45:59","guid":{"rendered":"http:\/\/edsionte.com\/techblog\/?p=1521"},"modified":"2011-11-09T14:29:58","modified_gmt":"2011-11-09T06:29:58","slug":"%e4%bd%a0%e7%9a%84%e7%ac%ac%e4%b8%80%e4%b8%aa%e4%b8%ad%e6%96%ad%e7%a8%8b%e5%ba%8f%ef%bc%81","status":"publish","type":"post","link":"http:\/\/edsionte.com\/techblog\/archives\/1521","title":{"rendered":"\u4f60\u7684\u7b2c\u4e00\u4e2a\u4e2d\u65ad\u7a0b\u5e8f\uff01"},"content":{"rendered":"

Last Update:2011\/11\/09<\/span><\/em><\/strong><\/p>\n

\u672c\u6587\u901a\u8fc7\u4e00\u4e2a\u7b80\u5355\u7684\u4e2d\u65ad\u7a0b\u5e8f\u6765\u63cf\u8ff0\u4e00\u822c\u4e2d\u65ad\u7a0b\u5e8f\u7684\u57fa\u672c\u6846\u67b6\u3002\u5b8c\u6574\u4ee3\u7801<\/strong>\u5728\u8fd9\u91cc<\/a>\u3002<\/p>\n

\u4e2d\u65ad\u7a0b\u5e8f\u4e00\u822c\u4f1a\u5305\u542b\u5728\u67d0\u4e2a\u8bbe\u5907\u7684\u9a71\u52a8\u7a0b\u5e8f\u4e2d\uff0c\u56e0\u6b64\uff0c\u63a5\u4e0b\u6765\u7684\u7a0b\u5e8f\u672c\u8d28\u4e0a\u8fd8\u662f\u4e00\u4e2a\u5185\u6838\u6a21\u5757\u3002\u8bf4\u5230\u5185\u6838\u6a21\u5757\uff0c\u4f60\u5e94\u8be5\u77e5\u9053\u9996\u5148\u53bb\u770b\u4ec0\u4e48\u4e86\u5427\uff1f\u5bf9\u4e86\uff0c\u5c31\u662f\u5185\u6838\u6a21\u5757\u52a0\u8f7d\u51fd\u6570\u3002<\/p>\n

static int __init myirq_init()\r\n{\r\n\tprintk(\"Module is working..\\n\");\r\n\tif(request_irq(irq,myirq_handler,IRQF_SHARED,devname,&mydev)!=0)\r\n\t{\r\n\t\tprintk(\"%s request IRQ:%d failed..\\n\",devname,irq);\r\n\t\treturn -1;\r\n\t}\r\n\tprintk(\"%s rquest IRQ:%d success..\\n\",devname,irq);\r\n\treturn 0;\r\n}<\/pre>\n
\u5728\u5185\u6838\u52a0\u8f7d\u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u9664\u4e86\u663e\u793a\u4e00\u4e9b\u4fe1\u606f\u5916\uff0c\u6700\u91cd\u8981\u7684\u5de5\u4f5c\u5c31\u662f\u7533\u8bf7\u4e00\u6839\u4e2d\u65ad\u8bf7\u6c42\u7ebf\uff0c\u4e5f\u5c31\u662f\u6ce8\u518c\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u3002\u5f88\u660e\u663e\uff0c\u8fd9\u4e00\u52a8\u4f5c\u662f\u901a\u8fc7request_irq\u51fd\u6570\u6765\u5b8c\u6210\u7684\u3002\u8fd9\u4e2a\u51fd\u6570\u7684\u539f\u578b\u5982\u4e0b\uff1a<\/p>\n
static int request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,const char *name, void *dev);<\/pre>\n
\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u4e2d\u65ad\u53f7\uff0c\u8fd9\u4e2a\u4e2d\u65ad\u53f7\u5bf9\u5e94\u7684\u5c31\u662f\u4e2d\u65ad\u63a7\u5236\u5668\u4e0aIRQ\u7ebf\u7684\u7f16\u53f7\u3002<\/p>\n
\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u4e00\u4e2airq_handler_t\u7c7b\u578b\u4e2a\u51fd\u6570\u6307\u9488\uff1a<\/p>\n
typedef irqreturn_t (*irq_handler_t)(int, void *);<\/pre>\n
handler\u6240\u6307\u5411\u7684\u51fd\u6570\u5373\u4e3a\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\uff0c\u9700\u8981\u5177\u4f53\u6765\u5b9e\u73b0\u3002<\/p>\n
\u7b2c\u4e09\u4e2a\u53c2\u6570\u4e3a\u6807\u5fd7\u4f4d\uff0c\u53ef\u4ee5\u53d6IRQF_DISABLED\u3001IRQF_SHARED\u548cIRQF_SAMPLE_RANDOM\u4e4b\u4e00\u3002\u5728\u672c\u5b9e\u4f8b\u7a0b\u5e8f\u4e2d\u53d6IRQF_SHARED\uff0c\u8be5\u6807\u5fd7\u8868\u793a\u591a\u4e2a\u8bbe\u5907\u5171\u4eab\u4e00\u6761IRQ\u7ebf\uff0c\u56e0\u6b64\u76f8\u5e94\u7684\u6bcf\u4e2a\u8bbe\u5907\u90fd\u9700\u8981\u5404\u81ea\u7684\u4e2d\u65ad\u670d\u52a1\u4f8b\u7a0b\u3002\u4e00\u822c\u67d0\u4e2a\u4e2d\u65ad\u7ebf\u4e0a\u7684\u4e2d\u65ad\u670d\u52a1\u7a0b\u5e8f\u5728\u6267\u884c\u65f6\u4f1a\u5c4f\u853d\u8bf7\u6c42\u8be5\u7ebf\u7684\u5176\u4ed6\u4e2d\u65ad\uff0c\u5982\u679c\u53d6IRQF_DISABLED\u6807\u5fd7\uff0c\u5219\u5728\u6267\u884c\u8be5\u4e2d\u65ad\u670d\u52a1\u7a0b\u5e8f\u65f6\u4f1a\u5c4f\u853d\u6240\u6709\u5176\u4ed6\u7684\u4e2d\u65ad\u3002\u53d6IRQF_SAMPLE_RANDOM\u5219\u8868\u793a\u8bbe\u5907\u53ef\u4ee5\u88ab\u770b\u505a\u662f\u4e8b\u4ef6\u968f\u89c1\u7684\u53d1\u751f\u6e90\u3002<\/p>\n
\u7b2c\u56db\u4e2a\u53c2\u6570\u662f\u8bf7\u6c42\u4e2d\u65ad\u7684\u8bbe\u5907\u7684\u540d\u79f0\u3002\u53ef\u4ee5\u5728\/proc\/interface\u4e2d\u67e5\u770b\u5230\u5177\u4f53\u8bbe\u5907\u7684\u540d\u79f0\uff0c\u4e0e\u6b64\u540c\u65f6\u4e5f\u53ef\u4ee5\u67e5\u770b\u5230\u8fd9\u4e2a\u8bbe\u5907\u5bf9\u5e94\u7684\u4e2d\u65ad\u53f7\u4ee5\u53ca\u8bf7\u6c42\u6b21\u6570\uff0c\u751a\u81f3\u4e2d\u65ad\u63a7\u5236\u5668\u7684\u540d\u79f0\u3002<\/p>\n
\u7b2c\u4e94\u4e2a\u53c2\u6570\u4e3a\u4e00\u4e2a\u6307\u9488\u578b\u53d8\u91cf\u3002\u6ce8\u610f\u6b64\u53c2\u6570\u4e3avoid\u578b\uff0c\u4e5f\u5c31\u662f\u8bf4\u901a\u8fc7\u5f3a\u5236\u8f6c\u6362\u53ef\u4ee5\u8f6c\u6362\u4e3a\u4efb\u610f\u7c7b\u578b\u3002\u8fd9\u4e2a\u53d8\u91cf\u5728IRQF_SHARED\u6807\u5fd7\u65f6\u4f7f\u7528\uff0c\u76ee\u7684\u662f\u4e3a\u5373\u5c06\u8981\u91ca\u653e\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u63d0\u4f9b\u552f\u4e00\u6807\u5fd7\u3002\u56e0\u4e3a\u591a\u4e2a\u8bbe\u5907\u5171\u4eab\u4e00\u6761\u4e2d\u65ad\u7ebf\uff0c\u56e0\u6b64\u8981\u91ca\u653e\u67d0\u4e2a\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u65f6\uff0c\u5fc5\u987b\u901a\u8fc7\u6b64\u6807\u5fd7\u6765\u552f\u4e00\u6307\u5b9a\u8fd9\u4e2a\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u3002\u4e60\u60ef\u4e0a\uff0c\u4f1a\u7ed9\u8fd9\u4e2a\u53c2\u6570\u4f20\u9012\u4e00\u4e2a\u4e0e\u8bbe\u5907\u9a71\u52a8\u7a0b\u5e8f\u5bf9\u5e94\u7684\u8bbe\u5907\u7ed3\u6784\u4f53\u6307\u9488\u3002\u5173\u4e8e\u4e2d\u65ad\u7a0b\u5e8f\uff0c\u53ef\u53c2\u8003\u8fd9\u91cc<\/a>\u7684\u6587\u7ae0\u3002<\/p>\n
\u4ee5\u4e0a\u5c31\u662frequest_irq\u51fd\u6570\u5404\u4e2a\u53c2\u6570\u7684\u610f\u4e49\u3002<\/p>\n
\u4e0e\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u7684\u6ce8\u518c\u76f8\u5bf9\u5e94\u7684\u662ffree_irq\u51fd\u6570\uff0c\u5b83\u4f1a\u6ce8\u9500\u76f8\u5e94\u7684\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\uff0c\u5e76\u91ca\u653e\u4e2d\u65ad\u7ebf\u3002\u8fd9\u4e2a\u51fd\u6570\u4e00\u822c\u88ab\u5728\u5185\u6838\u6a21\u5757\u5378\u8f7d\u51fd\u6570\u4e2d\u88ab\u8c03\u7528\u3002<\/p>\n
static void __exit myirq_exit()\r\n{\r\n\tprintk(\"Module is leaving..\\n\");\r\n\tfree_irq(irq,&mydev);\r\n\tprintk(\"%s request IRQ:%d success..\\n\",devname,irq);\r\n}<\/pre>\n
\u5982\u679c\u8be5\u4e2d\u65ad\u7ebf\u4e0d\u662f\u5171\u4eab\u7684\uff0c\u90a3\u4e48\u8be5\u51fd\u6570\u5728\u91ca\u653e\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u7684\u540c\u65f6\u4e5f\u5c06\u7981\u7528\u6b64\u6761\u4e2d\u65ad\u7ebf\u3002\u5982\u679c\u662f\u5171\u4eab\u4e2d\u65ad\u7ebf\uff0c\u53ea\u662f\u91ca\u653e\u4e0emydev\u5bf9\u5e94\u7684\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u3002\u9664\u975e\u8be5\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u6070\u597d\u4e3a\u8be5\u4e2d\u65ad\u7ebf\u4e0a\u7684\u6700\u540e\u4e00\u5458\uff0c\u6b64\u6761\u4e2d\u65ad\u7ebf\u624d\u4f1a\u88ab\u7981\u7528\u3002\u5728\u6b64\u5904\uff0c\u4f60\u4e5f\u53ef\u4ee5\u611f\u53d7\u5230mydev\u7684\u91cd\u8981\u6027\u3002<\/p>\n
\u4e0b\u9762\u5177\u4f53\u5206\u6790\u4e2d\u65ad\u5904\u7406\u51fd\u6570\u3002\u8be5\u51fd\u6570\u7684\u529f\u80fd\u5f88\u7b80\u5355\uff0c\u53ea\u662f\u663e\u793a\u4e00\u4e9b\u63d0\u793a\u4fe1\u606f\u3002<\/p>\n
static irqreturn_t myirq_handler(int irq,void* dev)\r\n{\r\n\tstruct myirq mydev;\r\n\tstatic int count=1;\r\n\tmydev=*(struct myirq*)dev;\r\n\tprintk(\"key: %d..\\n\",count);\r\n\tprintk(\"devid:%d ISR is working..\\n\",mydev.devid);\r\n\tprintk(\"ISR is leaving..\\n\");\r\n\tcount++;\r\n\treturn IRQ_HANDLED;\r\n}<\/pre>\n
\u53e6\u5916\uff0c\u672c\u5185\u6838\u6a21\u5757\u5728\u63d2\u5165\u65f6\u8fd8\u9700\u8981\u9644\u5e26\u53c2\u6570\uff0c\u4e0b\u9762\u7684\u8bed\u53e5\u9996\u5148\u5b9a\u4e49\u4e24\u4e2a\u53c2\u6570\uff0c\u7136\u540e\u5229\u7528\u5b8fmodule_param\u5b8f\u6765\u63a5\u53d7\u53c2\u6570\u3002<\/p>\n
static int irq;\r\nstatic char* devname;\r\n\r\nmodule_param(devname,charp,0644);\r\nmodule_param(irq,int,0644);<\/pre>\n
\u4f7f\u7528\u65b9\u6cd5\uff1a<\/strong><\/p>\n
1.\u901a\u8fc7cat \/proc\/interrupts\u67e5\u770b\u4e2d\u65ad\u53f7\uff0c\u4ee5\u786e\u5b9a\u4e00\u4e2a\u5373\u5c06\u8981\u5171\u4eab\u7684\u4e2d\u65ad\u53f7\u3002\u672c\u7a0b\u5e8f\u56e0\u4e3a\u662f\u4e0e\u952e\u76d8\u5171\u4eab1\u53f7\u4e2d\u65ad\u7ebf\uff0c\u56e0\u6b64irq=1\uff1b<\/strong><\/p>\n
2.\u4f7f\u7528\u5982\u4e0b\u547d\u4ee4\u5c31\u53ef\u4ee5\u63d2\u5165\u5185\u6838\uff1a<\/strong><\/p>\n
sudo insmod filename.ko irq=1 devname=myirq<\/strong><\/p>\n
3.\u518d\u6b21\u67e5\u770b\/proc\/interrupts\u6587\u4ef6\uff0c\u53ef\u4ee5\u53d1\u73b01\u53f7\u4e2d\u65ad\u7ebf\u5bf9\u5e94\u7684\u7684\u8bbe\u5907\u540d\u5904\u591a\u4e86myirq\u8bbe\u5907\u540d\uff1b<\/strong><\/p>\n
4.dmesg\u67e5\u770b\u5185\u6838\u65e5\u5fd7\u6587\u4ef6\uff0c\u53ef\u770b\u5230\u5728\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u4e2d\u6240\u663e\u793a\u7684\u4fe1\u606f\uff1b<\/strong><\/p>\n
5.\u5378\u8f7d\u5185\u6838\u6a21\u5757\uff1b<\/strong><\/p>\n
\u53ef\u4ee5\u770b\u5230\uff0c\u5185\u6838\u6a21\u5757\u52a0\u8f7d\u540e\uff0c\u6211\u4eec\u6240\u5199\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u662f\u88ab\u81ea\u52a8\u8c03\u7528\u7684\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u8be5\u4e2d\u65ad\u7ebf\u4e0a\u6709\u952e\u76d8\u6240\u53d1\u51fa\u7684\u4e2d\u65ad\u8bf7\u6c42\uff0c\u56e0\u6b64\u5185\u6838\u4f1a\u6267\u884c\u8be5\u4e2d\u65ad\u7ebf\u4e0a\u7684\u6240\u6709\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\uff0c\u5f53\u7136\u5c31\u5305\u62ec\u6211\u4eec\u4e0a\u8ff0\u6240\u5199\u7684\u90a3\u4e2a\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u3002\u5173\u4e8e\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u7684\u6267\u884c\uff0c\u53ef\u53c2\u8003\u8fd9\u91cc<\/a>\u7684\u6587\u7ae0\u3002<\/p>\n
\u8fd9\u6837\uff0c\u4e00\u4e2a\u6700\u57fa\u672c\u7684\u4e2d\u65ad\u7a0b\u5e8f\u5c31\u7f16\u5199\u5b8c\u6210\u4e86\uff01try\uff01<\/p>\n
\u540e\u8bb0\uff1a<\/strong><\/p>\n
\u8fd9\u4e2a\u7a0b\u5e8f\u8c03\u8bd5\u8d77\u6765\u5e76\u4e0d\u96be\uff0c\u4f46\u662f\u6211\u4eec\u5e76\u4e0d\u80fd\u4ec5\u4ec5\u5c40\u9650\u5728\u8fd9\u4e2a\u7a0b\u5e8f\u672c\u8eab\u3002\u4ee5\u5b83\u4e3a\u5165\u53e3\u70b9\u6df1\u5165\u5b66\u4e60\u4e2d\u65ad\u7684\u57fa\u672c\u539f\u7406\u518d\u597d\u4e0d\u8fc7\u3002\u4e0b\u9762\u7ed9\u51fa\u51e0\u4e2a\u5b66\u4e60\u7684\u5165\u53e3\u70b9\u3002<\/strong><\/p>\n
1.\u4e3a\u4f55\u6211\u4eec\u7684\u4e2d\u65ad\u7a0b\u5e8f\u548c\u5176\u4ed6\u8bbe\u5907\u5171\u4eab\u4e86\u4e00\u4e2a\u4e2d\u65ad\u7ebf\u540e\u4f1a\u88ab\u6267\u884c\uff1f\u6216\u8005\u8bf4\uff0c\u5171\u4eab\u4e2d\u65ad\u7ebf\u4e0a\u7684\u6240\u6709\u4e2d\u65ad\u670d\u52a1\u4f8b\u7a0b\u662f\u600e\u4e48\u6267\u884c\u7684\uff1f<\/strong><\/p>\n
2.\u4e2d\u65ad\u6d89\u53ca\u5230\u90a3\u4e9b\u57fa\u672c\u7684\u6570\u636e\u7ed3\u6784\uff1f\u8fd9\u4e9b\u6570\u636e\u7ed3\u6784\u4e4b\u95f4\u6709\u4ec0\u4e48\u5173\u7cfb\uff1f<\/strong><\/p>\n
3.do_IRQ()\u51fd\u6570\u7684\u5927\u4f53\u6267\u884c\u6d41\u7a0b\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n
\u4eb2\u4eec\uff0c\u8981\u5b66\u4e60\u7684\u4e1c\u897f\u8fd8\u5f88\u591a\uff0c\u8ba9\u6211\u4eec\u4e00\u8d77\u52a0\u6cb9\u5427\uff01<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"
Last Update:2011\/11\/09 \u672c\u6587\u901a\u8fc7\u4e00\u4e2a\u7b80\u5355\u7684\u4e2d\u65ad\u7a0b\u5e8f\u6765\u63cf\u8ff0\u4e00\u822c\u4e2d\u65ad\u7a0b\u5e8f\u7684\u57fa\u672c\u6846\u67b6\u3002\u5b8c\u6574\u4ee3\u7801 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[110],"tags":[134,108,157,403],"class_list":["post-1521","post","type-post","status-publish","format-standard","hentry","category-linux","tag-kernel","tag-linux","tag-157","tag-403"],"views":36853,"_links":{"self":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/1521","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/comments?post=1521"}],"version-history":[{"count":0,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/1521\/revisions"}],"wp:attachment":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/media?parent=1521"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/categories?post=1521"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/tags?post=1521"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}