{"id":376,"date":"2024-09-02T16:44:40","date_gmt":"2024-09-02T08:44:40","guid":{"rendered":"https:\/\/www.yanwenkai.com\/?p=376"},"modified":"2024-09-11T15:35:39","modified_gmt":"2024-09-11T07:35:39","slug":"linux%e7%9a%84%e4%b8%ad%e6%96%ad%e5%ad%a6%e4%b9%a0","status":"publish","type":"post","link":"https:\/\/www.yanwenkai.com\/?p=376","title":{"rendered":"linux\u7684\u4e2d\u65ad\u5b66\u4e60"},"content":{"rendered":"

1. \u524d\u8a00<\/h1>\n

  \u8fd9\u4e24\u5929\u505a\u9879\u76ee\u7528\u5230\u4e2d\u65ad\uff0c\u53d1\u73b0\u4ee5\u524d\u5b66\u7684\u90a3\u70b9\u4e1c\u897f\u90fd\u5fd8\u5149\u4e86\uff0c\u7d22\u6027\u5199\u4e2a\u7b14\u8bb0\u56de\u5fc6\u52a0\u5f3a\u4e00\u4e0b\u8bb0\u5fc6\uff01
\n  \u9996\u5148\uff0c\u4e2d\u65ad\u5206\u4e3a\u786c\u4e2d\u65ad\u548c\u8f6f\u4e2d\u65ad\u3002\u800c\u8f6f\u4e2d\u65ad\u53c8\u7ec6\u5206\u4e3a\u8f6f\u4e2d\u65ad\u3001tasklet\u3001\u5de5\u4f5c\u961f\u5217\uff1b\u6bcf\u79cd\u4e2d\u65ad\u90fd\u6709\u5176\u4f18\u7f3a\u70b9\uff0c\u4ee5\u53ca\u9002\u7528\u573a\u666f\uff0c\u5177\u4f53\u60c5\u51b5\u770b\u5982\u4e0b\u5206\u6790\u3002<\/p>\n

2. \u4e2d\u65ad\u7684\u6982\u5ff5<\/h1>\n

2.1 \u4e2d\u65ad\u7684\u4e0a\u534a\u90e8\u548c\u4e0b\u534a\u90e8<\/h2>\n

  \u8981\u8bb2\u4e2d\u65ad\u5c31\u8981\u5148\u8bb2\u6e05\u695a\u5b83\u5de5\u4f5c\u7684\u533a\u57df\uff0c\u4e2d\u65ad\u7684\u4e0a\u534a\u90e8\u548c\u4e0b\u534a\u90e8\u3002\u4e0a\u534a\u90e8\u662f\u6307\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\uff1b\u4e0b\u534a\u90e8\u662f\u6307\u4e00\u4e9b\u867d\u7136\u4e0e\u4e2d\u65ad\u6709\u76f8\u5173\u6027\u4f46\u662f\u53ef\u4ee5\u5ef6\u540e\u6267\u884c\u7684\u4efb\u52a1\u3002\uff08\u8fd9\u91cc\u7684\u4e0a\u534a\u90e8\u548c\u4e0b\u534a\u90e8\u5176\u5b9e\u5bf9\u5e94\u7684\u5c31\u662f\u786c\u4e2d\u65ad\u548c\u8f6f\u4e2d\u65ad\uff0c\u4e14\u4e0b\u534a\u90e8\u662f\u7531\u4e0a\u534a\u90e8\u8c03\u7528\u6765\u6267\u884c\u5ef6\u65f6\u8017\u65f6\u64cd\u4f5c\u7684\uff09\u3002
\n  \u4e24\u8005\u7684\u4e3b\u8981\u533a\u522b\u5728\u4e8e\uff1a\u4e2d\u65ad\u4e0a\u534a\u90e8\u4e0d\u80fd\u88ab\u76f8\u540c\u7c7b\u578b\u7684\u4e2d\u65ad\u6253\u65ad\uff0c\u800c\u4e0b\u534a\u90e8\u4f9d\u7136\u53ef\u4ee5\u88ab\u4e2d\u65ad\u6253\u65ad\uff1b\u4e2d\u65ad\u4e0a\u534a\u90e8\u5bf9\u4e8e\u65f6\u95f4\u975e\u5e38\u654f\u611f\uff0c\u800c\u4e0b\u534a\u90e8\u57fa\u672c\u4e0a\u90fd\u662f\u4e00\u4e9b\u53ef\u4ee5\u5ef6\u8fdf\u7684\u5de5\u4f5c\u3002\u7531\u4e8e\u4e8c\u8005\u7684\u8fd9\u79cd\u533a\u522b\uff0c\u6240\u4ee5\u5bf9\u4e8e\u4e00\u4e2a\u5de5\u4f5c\u662f\u653e\u5728\u4e0a\u534a\u90e8\u8fd8\u662f\u653e\u5728\u4e0b\u534a\u90e8\u53bb\u6267\u884c\uff0c\u53ef\u4ee5\u53c2\u8003\u4e0b\u97624\u6761\uff1a
\n  \u5982\u679c\u4e00\u4e2a\u4efb\u52a1\u5bf9\u65f6\u95f4\u975e\u5e38\u654f\u611f\uff0c\u5c06\u5176\u653e\u5728\u4e2d\u65ad\u4e0a\u534a\u90e8\u5904\u7406\u7a0b\u5e8f\u4e2d\u6267\u884c\u3002
\n  \u5982\u679c\u4e00\u4e2a\u4efb\u52a1\u548c\u786c\u4ef6\u76f8\u5173\uff0c\u5c06\u5176\u653e\u5728\u4e2d\u65ad\u4e0a\u534a\u90e8\u5904\u7406\u7a0b\u5e8f\u4e2d\u6267\u884c\u3002
\n  \u5982\u679c\u4e00\u4e2a\u4efb\u52a1\u8981\u4fdd\u8bc1\u4e0d\u88ab\u5176\u4ed6\u4e2d\u65ad\uff08\u7279\u522b\u662f\u76f8\u540c\u7684\u4e2d\u65ad\uff09\u6253\u65ad\uff0c\u5c06\u5176\u653e\u5728\u4e2d\u65ad\u4e0a\u534a\u90e8\u5904\u7406\u7a0b\u5e8f\u4e2d\u6267\u884c\u3002
\n  \u5176\u4ed6\u6240\u6709\u4efb\u52a1\uff0c\u8003\u8651\u653e\u5728\u4e0b\u534a\u90e8\u53bb\u6267\u884c\u3002<\/p>\n

2.2 \u4e2d\u65ad\u7684\u89e6\u53d1\u6d41\u7a0b<\/h2>\n

2.2.1 \u786c\u4ef6\u5c42\u9762<\/h3>\n

1.\u4e2d\u65ad\u8bf7\u6c42\uff1a
\n  \u5916\u90e8\u8bbe\u5907\uff08\u5982\u952e\u76d8\u3001\u7f51\u5361\u3001\u89e6\u6478\u5c4f\u7b49\uff09\u53d1\u751f\u67d0\u4e9b\u4e8b\u4ef6\uff08\u952e\u76d8\u6309\u4e0b\u3001\u6570\u636e\u5230\u8fbe\u3001\u89e6\u6478\u5c4f\u88ab\u89e6\u6478\uff09\u65f6\uff0c\u4f1a\u901a\u8fc7\u4e2d\u65ad\u8bf7\u6c42\u7ebf\u5411cpu\u53d1\u51fa\u4e2d\u65ad\u8bf7\u6c42\u4fe1\u53f7\u3002
\n  \u4e2d\u65ad\u63a7\u5236\u5668\uff08\u5982APIC\u3001PIC\uff09\u63a5\u6536\u5230\u4e2d\u65ad\u8bf7\u6c42\u4fe1\u53f7\uff0c\u5e76\u5c06\u5176\u6392\u961f\u5904\u7406\u3002
\n2.\u4e2d\u65ad\u63a7\u5236\u5668\u5904\u7406\uff1a
\n  \u4e2d\u65ad\u63a7\u5236\u5668\u4f1a\u6839\u636e\u4f18\u5148\u7ea7\u9009\u62e9\u4e00\u4e2a\u4e2d\u65ad\u8bf7\u6c42\uff0c\u5c06\u4e2d\u65ad\u4fe1\u53f7\u53d1\u7ed9CPU\u3002
\n  \u4e2d\u65ad\u63a7\u5236\u5668\u4f1a\u53d1\u9001\u4e2d\u65ad\u5411\u91cf\uff08\u4e2d\u65ad\u7c7b\u578b\u7f16\u53f7\uff09\u7ed9CPU\uff0c\u544a\u77e5\u662f\u54ea\u79cd\u4e2d\u65ad\u3002
\n3.CPU\u54cd\u5e94\uff1a
\n  CPU\u5b8c\u6210\u5f53\u524d\u6307\u4ee4\u540e\uff0c\u4fdd\u5b58\u5f53\u524d\u7684\u7a0b\u5e8f\u8ba1\u7b97\u5668\u548c\u5904\u7406\u5668\u72b6\u6001\u5bc4\u5b58\u5668\uff0c\u8fdb\u5165\u4e2d\u65ad\u5904\u7406\u6a21\u5f0f\u3002
\n  CPU\u7981\u7528\u4e2d\u65ad\uff08\u6216\u8bbe\u7f6e\u4e2d\u65ad\u5c4f\u853d\uff09\u4ee5\u907f\u514d\u5d4c\u5957\u4e2d\u65ad\uff0c\u83b7\u53d6\u4e2d\u65ad\u5411\u91cf\uff0c\u5224\u65ad\u4e2d\u65ad\u7c7b\u578b<\/p>\n

2.2.2 \u8f6f\u4ef6\u5c42\u9762<\/h3>\n

1.\u4e2d\u65ad\u5411\u91cf\u8868\uff1a
\n  \u6839\u636e\u4e2d\u65ad\u5411\u91cf\uff0cCPU\u67e5\u627e\u4e2d\u65ad\u5411\u91cf\u8868\uff08IVT\uff09\uff0c\u627e\u5230\u5bf9\u5e94\u7684\u4e2d\u65ad\u670d\u52a1\u7a0b\u5e8f\uff08ISR\uff09\u7684\u5165\u53e3\u5730\u5740\u3002
\n2.\u4e2d\u65ad\u670d\u52a1\u7a0b\u5e8f\uff08ISR\uff09\u6267\u884c\uff1a
\n  CPU\u8df3\u8f6c\u5230\u4e2d\u65ad\u670d\u52a1\u7a0b\u5e8f\u5165\u53e3\uff0c\u5f00\u59cb\u6267\u884cISR\u3002
\n  ISR\u4f1a\u5904\u7406\u786c\u4ef6\u8bbe\u5907\u7684\u4e2d\u65ad\u8bf7\u6c42\uff0c\u5982\u8bfb\u53d6\u6570\u636e\u3001\u6e05\u9664\u4e2d\u65ad\u6807\u5fd7\u7b49\u3002
\n3.\u4e0b\u534a\u90e8\u5904\u7406\uff1a
\n  \u5982\u679cISR\u6267\u884c\u65f6\u95f4\u8f83\u957f\u6216\u9700\u8981\u6267\u884c\u590d\u6742\u64cd\u4f5c\uff0c\u4f1a\u5c06\u8fd9\u4e9b\u64cd\u4f5c\u5ef6\u8fdf\u5230\u4e0b\u534a\u90e8\u5904\u7406\u3002
\n  \u4e0b\u534a\u90e8\u5904\u7406\u673a\u5236\u5305\u62ec\u8f6f\u4e2d\u65ad\u3001tasklets\u548c\u5de5\u4f5c\u961f\u5217\uff08workqueues\uff09\uff0c\u7528\u4e8e\u5904\u7406\u5ef6\u8fdf\u4efb\u52a1\u3002
\n4.\u6062\u590d\u6267\u884c\uff1a
\n  ISR\u5b8c\u6210\u540e\uff0c\u6062\u590d\u4e4b\u524d\u4fdd\u5b58\u7684\u5904\u7406\u5668\u72b6\u6001\u548c\u7a0b\u5e8f\u8ba1\u6570\u5668\u3002
\n  CPU\u91cd\u65b0\u542f\u7528\u4e2d\u65ad\uff08\u5982\u679c\u4e4b\u524d\u7981\u7528\u4e86\u4e2d\u65ad\uff09\uff0c\u7ee7\u7eed\u6267\u884c\u88ab\u4e2d\u65ad\u7684\u7a0b\u5e8f\u3002<\/p>\n

2.2.3 \u6d41\u7a0b\u56fe<\/h3>\n
[\u5916\u90e8\u8bbe\u5907\u4e8b\u4ef6] --> [\u4e2d\u65ad\u63a7\u5236\u5668\u6536\u5230\u4e2d\u65ad\u8bf7\u6c42] --> [\u4e2d\u65ad\u63a7\u5236\u5668\u53d1\u9001\u4e2d\u65ad\u4fe1\u53f7\u7ed9CPU] --> [CPU\u4fdd\u5b58\u72b6\u6001\u5e76\u7981\u7528\u4e2d\u65ad] --> [CPU\u6839\u636e\u4e2d\u65ad\u5411\u91cf\u67e5\u627eISR] --> [ISR\u5904\u7406\u4e2d\u65ad\u8bf7\u6c42] --> [ISR\u5ef6\u8fdf\u4efb\u52a1\u5230\u4e0b\u534a\u90e8\u5904\u7406] --> [ISR\u5b8c\u6210\u540e\u6062\u590d\u72b6\u6001] --> [CPU\u91cd\u65b0\u542f\u7528\u4e2d\u65ad] --> [CPU\u7ee7\u7eed\u6267\u884c\u88ab\u4e2d\u65ad\u7684\u7a0b\u5e8f]<\/code><\/pre>\n
3 \u4e2d\u65ad\u7684\u5e94\u7528<\/h1>\n
3.1 \u786c\u4e2d\u65ad<\/h2>\n
  \u4ece\u4e0a\u6587\u53ef\u77e5\u786c\u4e2d\u65ad\u5c31\u662f\u4e2d\u65ad\u7684\u4e0a\u534a\u90e8\uff0c\u7528\u4e8e\u6267\u884c\u4e0d\u8017\u65f6\u7684\u64cd\u4f5c\u3002
\n  \u5728\u5b9e\u9645\u4f7f\u7528\u4e2d\u6211\u4eec\u7533\u8bf7\u7684\u4e2d\u65ad\u53f7\uff08\u7528reques_irq\u7533\u8bf7\uff09\uff0c\u6ce8\u518c\u4e2d\u65ad\u7ed1\u5b9a\u7684\u4e2d\u65ad\u51fd\u6570\u90fd\u662f\u786c\u4e2d\u65ad\u3002\u5982\u4e0b\u4ee3\u7801\u6240\u793a\uff0c\u89e6\u53d1\u4e2d\u65ad\u540e\u6267\u884c\u7ed1\u5b9a\u7684\u4e2d\u65ad\u51fd\u6570\uff0c\u6574\u4e2a\u8fc7\u7a0b\u5c31\u662f\u786c\u4e2d\u65ad\u7684\u8c03\u7528\u3002<\/p>\n
3.1.1 \u63a5\u53e3<\/h3>\n
struct device_node *of_find_compatible_node(struct device_node *from,\n    const char *type, const char *compat);\n \u529f\u80fd\uff1a\u901a\u8fc7compatible\u5c5e\u6027\u67e5\u627e\u6307\u5b9a\u8282\u70b9\n \u53c2\u6570\uff1a\n    @from   - \u6307\u5411\u5f00\u59cb\u8def\u5f84\u7684\u8282\u70b9\uff0c\u5982\u679c\u4e3aNULL\uff0c\u5219\u4ece\u6839\u8282\u70b9\u5f00\u59cb\n    @type   - device_type\u8bbe\u5907\u7c7b\u578b\uff0c\u53ef\u4ee5\u4e3aNULL\n    @compat - \u6307\u5411\u8282\u70b9\u7684compatible\u5c5e\u6027\u7684\u503c\uff08\u5b57\u7b26\u4e32\uff09\u7684\u2fb8\u5730\u5740\n \u8fd4\u56de\u503c\uff1a\u6210\u529f\uff1a\u5f97\u5230\u8282\u70b9\u7684\u2fb8\u5730\u5740\uff1b\u5931\u8d25\uff1aNULL \n\nunsigned int irq_of_parse_and_map(struct device_node *dev, int index)\n\u529f\u80fd\uff1a\u89e3\u6790\u8bbe\u5907\u6811\u5e76\u6620\u5c04\u4ea7\u751f\u8f6f\u4e2d\u65ad\u53f7\n\u53c2\u6570\uff1a\n     @dev:\u8282\u70b9\u6307\u9488\n     @index:interrupts\u540e\u5199\u7684\u4e2d\u65ad\u7684\u63cf\u8ff0\u7684\u4e0b\u6807\n\u8fd4\u56de\u503c\uff1a\u6210\u529f\u8fd4\u56de\u8f6f\u4e2d\u65ad\u53f7\uff0c\u5931\u8d25\u8fd4\u56de0\n\nint request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,\n        const char *name, void *dev)\n\u529f\u80fd\uff1a\u6ce8\u518c\u4e2d\u65ad\n\u53c2\u6570\uff1b\n    @irq:\u8f6f\u4e2d\u65ad\u53f7 \uff08\u4ee5\u540e\u5728\u5185\u6838\u4e2d\u4f7f\u7528\u7684\u4e2d\u65ad\u53f7\u90fd\u662f\u8f6f\u4e2d\u65ad\u53f7\uff09\n    @handler:\u4e2d\u65ad\u5904\u7406\u51fd\u6570\u7684\u6307\u9488\n        irqreturn_t irq_handle(int irq, void *dev)\n        {\n            \/\/\u4e2d\u65ad\u5904\u7406\u51fd\u6570\uff0c\u4e2d\u65ad\u5904\u7406\u51fd\u6570\u4e2d\u4e0d\u80fd\u505a\u5ef6\u65f6\uff0c\u8017\u65f6\uff0c\u751a\u81f3\u4f11\u7720\u7684\u64cd\u4f5c\n\n            \/\/return IRQ_NONE; \/\/\u4e2d\u65ad\u6ca1\u6709\u5904\u7406\u5b8c\u6210\n            return IRQ_HANDLED;\/\/\u4e2d\u65ad\u6267\u884c\u6210\u529f\uff0c\u4e2d\u65ad\u5904\u7406\u5b8c\u6210\u4e86\n        }\n    @flags:\u4e2d\u65ad\u89e6\u53d1\u65b9\u5f0f\n            IRQF_TRIGGER_RISING   \/\/\u4e0a\u5347\u6cbf\u89e6\u53d1\n            IRQF_TRIGGER_FALLING  \/\/\u4e0b\u964d\u6cbf\u89e6\u53d1\n            IRQF_TRIGGER_HIGH     \/\/\u9ad8\u7535\u5e73\u89e6\u53d1\n            IRQF_TRIGGER_LOW      \/\/\u4f4e\u7535\u5e73\u89e6\u53d1\n            IRQF_SHARED           \/\/\u5171\u4eab\u4e2d\u65ad\n    @name:\u4e2d\u65ad\u7684\u540d\u5b57\n            cat \/proc\/interrupts\n    @dev:\u5411\u4e2d\u65ad\u5904\u7406\u51fd\u6570\u4f20\u9012\u7684\u53c2\u6570\n\u8fd4\u56de\u503c\uff1a\u6210\u529f\u8fd4\u56de0\uff0c\u5931\u8d25\u8fd4\u56de\u9519\u8bef\u7801    \n\nconst void *free_irq(unsigned int irq, void *dev_id)\n\u529f\u80fd\uff1a\u91ca\u653e\u4e2d\u65ad\n\u53c2\u6570\uff1a\n     @irq:\u8f6f\u4e2d\u65ad\u53f7\n     @dev_id:\u6ce8\u518c\u4e2d\u65ad\u65f6\u5019\u7684\u7b2c5\u4e2a\u53c2\u6570\n\u8fd4\u56de\u503c\uff1a\u8fd4\u56dedevname<\/code><\/pre>\n
interrupt-parent = <&gpio3>;\ninterrupts = ;<\/code><\/pre>\n
  \u8fd9\u662f\u56e0\u4e3a\u8bbe\u5907\u6811\u7684interrupts\u8282\u70b9\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u5373\u662f\u5b83\u7684\u5f15\u811a\u7f16\u53f7\u4e5f\u662f\u5b83\u7684\u4e2d\u65ad\u53f7\uff0c\u65e2\u662f103\u53f7\u4e2d\u65ad\uff08332+\uff080<\/em>8+7\uff09\u8f6c\u6362\u65b9\u5f0f\u770b\u6211\u6587\u7ae0\uff09\u3002
\n  \u901a\u8fc7request_irq\u51fd\u6570\uff0c\u5c06\u8bbe\u5907\u6811\u7684\u4e2d\u65ad\u53f7\u6620\u5c04\u5230\u5185\u6838\u83b7\u53d6\u5230\u8f6f\u4e2d\u65ad\u53f7\uff0c\u518d\u4e0e\u786c\u4e2d\u65ad\u7684\u51fd\u6570\u7ed1\u5b9a\u3002<\/p>\n
3.1.2\u793a\u4f8b<\/h3>\n
#include \n#include \n#include \n#include \n#include \n\/*\nmyirq{\n    compatible = \"aaaa,myirq\";\n    interrupt-parent = <&gpiof>;\n    interrupts = <9 0>;\n};\n*\/\n\nstruct device_node *node;\nunsigned int irqno;\n#define name \"key1\";\nirqreturn_t key_irq_handle(int irq, void* dev)\n{\n    printk(\"\u6267\u884c\u4e2d\u65ad\u903b\u8f91\\n\");\n    return IRQ_HANDLED;\n}\nstatic int __init myirq_init(void)\n{\n    int i, ret;\n    \/\/ 1.\u83b7\u53d6\u8bbe\u5907\u6811\u4e2d\u7684\u8282\u70b9\n    node = of_find_compatible_node(NULL, NULL, \"aaaa,myirq\");\n    if (node == NULL) {\n        printk(\"get node error\\n\");\n        return -EINVAL;\n    }\n    \/\/ 2.\u6620\u5c04\u5f97\u5230\u8f6f\u4e2d\u65ad\u53f7\n        irqno = irq_of_parse_and_map(node, 0);\n        if (irqno == 0) {\n            printk(\"get irqno error\\n\");\n            return -EAGAIN;\n        }\n\n        \/\/ 3.\u6ce8\u518c\u4e2d\u65ad\n        ret = request_irq(irqno, key_irq_handle,\n            IRQF_TRIGGER_FALLING, name, 0);\n        if (ret) {\n            printk(\"request irq error\\n\");\n            return ret;\n        }\n    }\n\n    return 0;\n}\nstatic void __exit myirq_exit(void)\n{\n        free_irq(irqno, 0);\n}\nmodule_init(myirq_init);\nmodule_exit(myirq_exit);\nMODULE_LICENSE(\"GPL\");<\/code><\/pre>\n
3.2 \u8f6f\u4e2d\u65ad<\/h2>\n
  \u8f6f\u4e2d\u65ad\u662f\u4e00\u7ec4\u9759\u6001\u5b9a\u4e49\u7684\u4e0b\u534a\u90e8\u63a5\u53e3\uff0c\u53ef\u4ee5\u5728\u6240\u6709\u5904\u7406\u5668\u4e0a\u540c\u65f6\u6267\u884c\uff0c\u5373\u4f7f\u4e24\u4e2a\u7c7b\u578b\u76f8\u540c\u4e5f\u53ef\u4ee5\u3002
\n  \u4f46\u4e00\u4e2a\u8f6f\u4e2d\u65ad\u4e0d\u4f1a\u62a2\u5360\u53e6\u4e00\u4e2a\u8f6f\u4e2d\u65ad\uff0c\u552f\u4e00\u53ef\u4ee5\u62a2\u5360\u8f6f\u4e2d\u65ad\u7684\u662f\u786c\u4e2d\u65ad\u3002
\n  \u76ee\u524dLinux\u7cfb\u7edf\u6700\u591a\u652f\u630132\u4e2a\u8f6f\u4e2d\u65ad\uff0c\u7cfb\u7edf\u5df2\u7ecf\u5b9a\u4e49\u4f7f\u7528\u4e8610\u4e2a\uff0c\u5269\u4e0b\u7684\u7528\u6237\u53ef\u4ee5\u81ea\u5df1\u6307\u5b9a\uff0c\u4f46\u662f\u770b\u4e00\u4e0b\u524d\u9762\u7684\u8bf4\u660e\uff01\u907f\u514d\u81ea\u5df1\u521b\u5efa\u8f6f\u4e2d\u65ad\uff0c\u5982\u679c\u4e0d\u662f\u9700\u8981\u9ad8\u9891\u7387\u7684\u7ebf\u7a0b\u5de5\u4f5c\u8c03\u5ea6\uff0c\u4e00\u822c\u6765\u8bf4\u7cfb\u7edf\u63d0\u4f9b\u7684\u8f6f\u4e2d\u65ad\u5df2\u7ecf\u591f\u6211\u4eec\u4f7f\u7528\u4e86\uff0c\u6211\u4eec\u5728\u65e5\u5e38\u5f00\u53d1\u4e2d\u6700\u597d\u8fd8\u662f\u9075\u5faa\u7cfb\u7edf\u7ed9\u51fa\u7684\u6307\u5bfc\u5efa\u8bae\uff0c\u907f\u514d\u51fa\u73b0\u5f02\u5e38\uff0c\u65e5\u5e38\u7684\u5b66\u4e60\u8c03\u8bd5\uff0c\u6211\u4eec\u53ef\u4ee5\u521b\u5efa\u81ea\u5df1\u7684\u8f6f\u4e2d\u65ad\uff0c\u52a0\u6df1\u5bf9\u8fd9\u65b9\u9762\u77e5\u8bc6\u7684\u7406\u89e3\u3002\u4e0a\u9762\u5217\u51fa\u7684\u8f6f\u4e2d\u65ad\u7c7b\u578b\u8d8a\u9760\u524d\u4f18\u5148\u7ea7\u8d8a\u9ad8\uff0c\u5176\u4e2d\u6709\u4e24\u4e2a\u9700\u8981\u5173\u6ce8\u4e00\u4e0b\uff0c\u5c31\u662fHI_SOFTIRQ\u548cTASKLET_SOFTIRQ\uff0c\u7cfb\u7edf\u5df2\u7ecf\u5e2e\u6211\u4eec\u521d\u59cb\u5316\u597d\u4e86\uff0ctasklet\u5c31\u662f\u57fa\u4e8e\u8fd9\u4e24\u4e2a\u8f6f\u4e2d\u65ad\u53bb\u5b9e\u73b0\u7684\u3002
\n  \u8fd9\u91cc\u7b80\u4ecb\u4e00\u4e0b\u8f6f\u4e2d\u65ad\u7684\u6dfb\u52a0\u6d41\u7a0b\uff0c\u5b9e\u9645\u5e94\u7528\u5728\u8fd8\u662f\u4ee5tasklet\u548c\u5de5\u4f5c\u961f\u5217\u4e3a\u4e3b\u3002
\n1.\u6dfb\u52a0\u6211\u4eec\u81ea\u5df1\u7684\u8f6f\u4e2d\u65ad<\/p>\n
enum\n{\n    HI_SOFTIRQ=0,\n    TIMER_SOFTIRQ,\n    NET_TX_SOFTIRQ,\n    NET_RX_SOFTIRQ,\n    BLOCK_SOFTIRQ,\n    BLOCK_IOPOLL_SOFTIRQ,\n    TASKLET_SOFTIRQ,\n    SCHED_SOFTIRQ,\n    HRTIMER_SOFTIRQ,\n    MY_SOFTIRQ,      \/*\u6211\u81ea\u5df1\u6dfb\u52a0\u7684\u8f6f\u4e2d\u65ad*\/ \n    RCU_SOFTIRQ,    \/* Preferable RCU should always be the last softirq *\/\n\n    NR_SOFTIRQS\n};<\/code><\/pre>\n
2.\u5728kernel\/softirq.c\u4e2d\u5b9a\u4e49\u81ea\u5df1\u7684\u8f6f\u4e2d\u65ad\u5904\u7406\u51fd\u6570<\/p>\n
\/\/\u6211\u81ea\u5df1\u5b9a\u4e49\u7684\u8f6f\u4e2d\u65ad\u5904\u7406\u51fd\u6570\nstatic void my_softirq_action(struct softirq_action *a)\n{\n    ...\n}<\/code><\/pre>\n
3.\u521d\u59cb\u5316<\/p>\n
void __init softirq_init(void)\n{\n    int cpu;\n\n    for_each_possible_cpu(cpu) {\n        per_cpu(tasklet_vec, cpu).tail =\n            &per_cpu(tasklet_vec, cpu).head;\n        per_cpu(tasklet_hi_vec, cpu).tail =\n            &per_cpu(tasklet_hi_vec, cpu).head;\n    }\n\n    open_softirq(TASKLET_SOFTIRQ, tasklet_action);\n    open_softirq(HI_SOFTIRQ, tasklet_hi_action);\n    open_softirq(MY_SOFTIRQ, tasklet_hi_action);\/\/\u6211\u81ea\u5df1\u5b9a\u4e49\u7684\u8f6f\u4e2d\u65ad\n}<\/code><\/pre>\n
4.\u6fc0\u6d3b<\/p>\n
raise_softirq(MY_SOFTIRQ);<\/code><\/pre>\n
  \u5b9a\u4e49\u4e86\u8f6f\u4e2d\u65ad\uff0c\u90a3\u8ddf\u7cfb\u7edf\u81ea\u5e26\u7684\u8f6f\u4e2d\u65ad\uff0c\u5b83\u4eec\u5728\u4ec0\u4e48\u65f6\u5019\u5f97\u5230\u6267\u884c\u5462\uff1f\u6211\u4eec\u6765\u770b\u4e00\u4e0b do_softirq\u51fd\u6570:
\n  \u6587\u4ef6\u8def\u5f84\\:kernel\/softirq.c<\/p>\n
asmlinkage void do_softirq(void)\n{\n    __u32 pending;\n    unsigned long flags;\n\n    if (in_interrupt())\/\/\u5224\u65ad\u5f53\u524d\u662f\u5426\u5904\u4e8e\u4e2d\u65ad\u72b6\u6001\n        return;\n\n    local_irq_save(flags);\/\/\u4fdd\u5b58\u4e2d\u65ad\u6807\u8bb0\n\n    pending = local_softirq_pending();\n\n    if (pending)\/\/\u5faa\u73af\u5904\u7406\u5df2\u7ecf\u6ce8\u518c\u7684\u8f6f\u4e2d\u65ad\n        __do_softirq();\n\n    local_irq_restore(flags);\n}<\/code><\/pre>\n
  \u8fd9\u79cd\u65b9\u5f0f\u6211\u6ca1\u6709\u4f7f\u7528\u8fc7\uff0c\u867d\u8bf4\u6548\u7387\u6700\u9ad8\uff0c\u4f46\u8c03\u7528\u6d41\u7a0b\u6bd4\u8f83\u590d\u6742\uff0c\u63a8\u8350\u4f7f\u7528\u5176\u4ed6\u7684\u8f6f\u4e2d\u65ad\u3002<\/p>\n
3.3 tasklet\u4e2d\u65ad<\/h2>\n
  tasklet\u662f\u57fa\u4e8e\u8f6f\u4e2d\u65ad\u7684\u673a\u5236\u5b9e\u73b0\u7684<\/p>\n
3.3.1 \u63a5\u53e3<\/h3>\n
1.\u5206\u914d\u5bf9\u8c61\n    struct tasklet_struct\n    {\n        struct tasklet_struct *next; \/\/tasklet\u7684\u94fe\u8868\n        unsigned long state;         \/\/\u662f\u5426\u9700\u8981\u89e6\u53d1\u5e95\u534a\u90e8\u7684\u72b6\u6001\n        atomic_t count;              \/\/\u89e6\u53d1\u7684\u6b21\u6570\n        bool use_callback;           \/\/true\u4f7f\u7528callback \uff0cfalse\u4f7f\u7528func \n        union {\n            void (*func)(unsigned long data); \/\/\u65e7\u7248\u672c\n            void (*callback)(struct tasklet_struct *t); \/\/\u65b0\u7248\u672c\n        };\n        unsigned long data; \/\/\u4f20\u9012\u53c2\u6570\n    };\n\n struct tasklet_struct tasklet;\n2.\u5bf9\u8c61\u521d\u59cb\u5316\n    void tasklet_init(struct tasklet_struct *t,\n    void (*func)(unsigned long), unsigned long data) \/\/\u65e7\u7248\u672c\u7684\u521d\u59cb\u5316\n    void tasklet_setup(struct tasklet_struct *t,\n     void (*callback)(struct tasklet_struct *)) \/\/\u65b0\u7248\u672c\u7684\u521d\u59cb\u5316\n3.\u8c03\u7528\u6267\u884c\n    void tasklet_schedule(struct tasklet_struct *t)<\/code><\/pre>\n
3.3.2 \u793a\u4f8b<\/h3>\n
#include \n#include \n#include \n#include \n#include \n#include \n\/*\nmyirq{\n    compatible = \"aaaa,myirq\";\n    interrupt-parent = <&gpiof>;\n    interrupts = <9 0>;\n};\n*\/\nstruct device_node *node;\nunsigned int irqno;\n#define name \"key1\";\nstruct tasklet_struct tasklet;\n\/\/\u5e95\u534a\u90e8\u5904\u7406\u51fd\u6570\nvoid irq_tasklet_bottom(struct tasklet_struct* tasklet)\n{\n    \/\/5.\u6267\u884c\u5ef6\u65f6\u64cd\u4f5c\u903b\u8f91\n\n}\n\/\/\u4e2d\u65ad\u9876\u534a\u90e8\nirqreturn_t key_irq_handle(int irq, void* dev)\n{\n    \/\/4.\u5f00\u59cb\u5e95\u534a\u90e8\n    tasklet_schedule(&tasklet);\n    return IRQ_HANDLED;\n}\n\nstatic int __init myirq_init(void)\n{\n    int i, ret;\n    \/\/ 0.tasklet_setup\u521d\u59cb\u5316\n    tasklet_setup(&tasklet, irq_tasklet_bottom);\n\n    \/\/ 1.\u83b7\u53d6\u8bbe\u5907\u6811\u4e2d\u7684\u8282\u70b9\n    node = of_find_compatible_node(NULL, NULL, \"aaaa,myirq\");\n    if (node == NULL) {\n        printk(\"get node error\\n\");\n        return -EINVAL;\n    }\n    \/\/ 2.\u6620\u5c04\u5f97\u5230\u8f6f\u4e2d\u65ad\u53f7\n        irqno = irq_of_parse_and_map(node, 0);\n        if (irqno == 0) {\n            printk(\"get irqno error\\n\");\n            return -EAGAIN;\n        }\n\n    \/\/ 3.\u6ce8\u518c\u4e2d\u65ad\n        ret = request_irq(irqno, key_irq_handle,\n            IRQF_TRIGGER_FALLING, name, 0;\n        if (ret) {\n            printk(\"request irq error\\n\");\n            return ret;\n        }\n    }\n\n    return 0;\n}\nstatic void __exit myirq_exit(void)\n{\n        free_irq(irqno, 0);\n}\nmodule_init(myirq_init);\nmodule_exit(myirq_exit);\nMODULE_LICENSE(\"GPL\");<\/code><\/pre>\n
  \u5b9a\u4e49tasklet\u53d8\u91cf\uff0c\u5b9e\u73b0\u8f6f\u4e2d\u65ad\u5904\u7406\u51fd\u6570\uff0c\u521d\u59cb\u5316\uff0c\u8c03\u5ea6\uff0c\u4ee5\u4e0a\u8fd9\u4e9b\u5c31\u662ftasklet\u7684\u4f7f\u7528\u6b65\u9aa4\u4e86\uff0c\u5185\u6838\u5e2e\u6211\u4eec\u7701\u7565\u4e86\u5f88\u591a\u9ebb\u70e6\u7684\u5b9e\u73b0\uff0c\u6240\u4ee5\u4f7f\u7528\u8d77\u6765\u6bd4\u8f83\u7b80\u5355\u3002<\/p>\n
3.4 \u5de5\u4f5c\u961f\u5217\uff08workqueue\uff09<\/h2>\n
  \u524d\u9762\u5df2\u7ecf\u8bb2\u4e86\u8f6f\u4e2d\u65ad\u8fd8\u6709tasklet\u4e86\uff0c\u90a3\u8fd9\u91cc\u7684\u5de5\u4f5c\u961f\u5217\u548c\u5b83\u4eec\u6709\u4ec0\u4e48\u533a\u522b\u5462\uff1f\u4e3a\u4ec0\u4e48\u4f1a\u5b58\u5728\u5de5\u4f5c\u961f\u5217\u673a\u5236\uff1f
\n  \u5b58\u5728\u5373\u662f\u5408\u7406\uff0c\u65e2\u7136\u5b58\u5728\u90a3\u80af\u5b9a\u662f\u7528\u6765\u5f25\u8865\u524d\u4e24\u8005\u7684\u7f3a\u9677\u7684\uff0c\u6240\u4ee5\u6211\u4eec\u5148\u6765\u5206\u6790\u770b\u770b\u524d\u4e24\u8005\u6709\u4ec0\u4e48\u7f3a\u70b9\u3002
\n  \u8f6f\u4e2d\u65ad\u548ctasklet\u662f\u8fd0\u884c\u4e8e\u4e2d\u65ad\u4e0a\u4e0b\u6587\u7684\uff0c\u5b83\u4eec\u5c5e\u4e8e\u5185\u6838\u6001\u6ca1\u6709\u8fdb\u7a0b\u7684\u5207\u6362\uff0c\u56e0\u6b64\u5728\u6267\u884c\u8fc7\u7a0b\u4e2d\u4e0d\u80fd\u4f11\u7720\uff0c\u4e0d\u80fd\u963b\u585e\uff0c\u4e00\u65e6\u4f11\u7720\u6216\u8005\u963b\u585e\uff0c\u5219\u7cfb\u7edf\u76f4\u63a5\u6302\u6b7b\u3002\u6bd4\u5982\u6211\u8c03\u8bd5\u9a71\u52a8\u65f6\u5019\uff0c\u66fe\u7ecf\u5728\u4e2d\u65ad\u5904\u7406\u51fd\u6570\u4e2d\u8c03\u7528spi\u540c\u6b65\u6570\u636e\u7684\u51fd\u6570\uff0c\u7cfb\u7edf\u76f4\u63a5\u6302\u6b7b\u4e86\uff0c\u540e\u6765\u770b\u4ee3\u7801\u7684\u8bf4\u660e\u624d\u660e\u767d\uff0c\u4e0d\u80fd\u5728\u4e2d\u65ad\u4e2d\u8c03\u7528\u4f11\u7720\uff0c\u963b\u585e\u7684\u51fd\u6570\u3002\u56e0\u6b64\u8f6f\u4e2d\u65ad\u548ctasklet\u662f\u6709\u4e00\u5b9a\u7684\u4f7f\u7528\u5c40\u9650\u6027\u7684\uff0c\u5de5\u4f5c\u961f\u5217\u7684\u51fa\u73b0\u6b63\u662f\u7528\u5728\u8f6f\u4e2d\u65ad\u548ctasklet\u4e0d\u80fd\u4f7f\u7528\u7684\u573a\u5408\uff0c\u6bd4\u5982\u9700\u8981\u8c03\u7528\u4e00\u4e2a\u5177\u6709\u53ef\u5ef6\u8fdf\u51fd\u6570\u7684\u7279\u8d28\uff0c\u4f46\u662f\u8fd9\u4e2a\u51fd\u6570\u53c8\u6709\u53ef\u80fd\u5f15\u8d77\u4f11\u7720\u3001\u963b\u585e\u3002<\/p>\n
3.4.1 \u63a5\u53e3<\/h3>\n
1.\u5206\u914d\u5bf9\u8c61\n struct work_struct {\n        atomic_long_t data; \/\/\u53ef\u4ee5\u5411\u5e95\u534a\u90e8\u5904\u7406\u51fd\u6570\u4f20\u9012\u6570\u636e\n        struct list_head entry; \/\/\u6784\u6210\u961f\u5217\u9879\n        work_func_t func; \/\/\u5e95\u534a\u90e8\u5904\u7406\u51fd\u6570\n };\n struct work_struct work;\n2.\u5bf9\u8c61\u521d\u59cb\u5316\n    void mywork_func(struct work_struct *work)\n {\n     \/\/\u5de5\u4f5c\u961f\u5217\u7684\u5e95\u534a\u90e8\u5904\u7406\u51fd\u6570\n }\n    INIT_WORK(&work, mywork_func) \n\n3.\u8c03\u7528\u6267\u884c\n    bool schedule_work(struct work_struct *work)\n\n4.\u4fdd\u8bc1\u5e95\u534a\u90e8\u6267\u884c\u7ed3\u675f\u5728\u5378\u8f7d\u9a71\u52a8\u9632\u6b62Oops\u7684\u7a7a\u6307\u9488\u9519\u8bef\n    cancel_work_sync(&work);<\/code><\/pre>\n
3.4.2 \u793a\u4f8b<\/h3>\n
#include \n#include \n#include \n#include \n#include \n#include \n#include \n\/*\nmyirq{\n    compatible = \"aaaa,myirq\";\n    interrupt-parent = <&gpiof>;\n    interrupts = <9 0>;\n};\n*\/\n\nstruct device_node *node;\nunsigned int irqno;\n#define name \"key1\";\nstruct work_struct work;\n\n\/\/\u5e95\u534a\u90e8\u5904\u7406\u51fd\u6570\nvoid irq_work_func(struct work_struct* mwork)\n{\n     \/\/5.\u6267\u884c\u5ef6\u65f6\u64cd\u4f5c\u903b\u8f91\n}\n\/\/\u4e2d\u65ad\u9876\u534a\u90e8\nirqreturn_t key_irq_handle(int irq, void* dev)\n{\n\n   \/\/4.\u8c03\u7528\u5de5\u4f5c\u961f\u5217\n    schedule_work(&work);\n    return IRQ_HANDLED;\n}\n\nstatic int __init myirq_init(void)\n{\n    int i, ret;\n    \/\/ 0.tasklet_setup\u521d\u59cb\u5316\n    INIT_WORK(&work, irq_work_func);\n\n    \/\/ 1.\u83b7\u53d6\u8bbe\u5907\u6811\u4e2d\u7684\u8282\u70b9\n    node = of_find_compatible_node(NULL, NULL, \"aaaa,myirq\");\n    if (node == NULL) {\n        printk(\"get node error\\n\");\n        return -EINVAL;\n    }\n    \/\/ 2.\u6620\u5c04\u5f97\u5230\u8f6f\u4e2d\u65ad\u53f7\n        irqno = irq_of_parse_and_map(node, 0);\n        if (irqno == 0) {\n            printk(\"get irqno error\\n\");\n            return -EAGAIN;\n        }\n\n        \/\/ 3.\u6ce8\u518c\u4e2d\u65ad\n        ret = request_irq(irqno, key_irq_handle,\n            IRQF_TRIGGER_FALLING, name, 0);\n        if (ret) {\n            printk(\"request irq error\\n\");\n            return ret;\n        }\n    }\n\n    return 0;\n}\nstatic void __exit myirq_exit(void)\n{\n    int i;\n    cancel_work_sync(&work);\n    free_irq(irqno,0);\n}\nmodule_init(myirq_init);\nmodule_exit(myirq_exit);\nMODULE_LICENSE(\"GPL\");<\/code><\/pre>\n
3.5 \u5e94\u7528\u5b9e\u4f8b<\/h2>\n
  \u5de5\u4f5c\u961f\u5217\uff08workqueue\uff09\u548ctasklet\u7684\u4f7f\u7528\u601d\u8def\u662f\u5dee\u4e0d\u591a\u7684\uff0c\u5404\u6709\u5c40\u9650\u6027\uff0c\u5b9e\u9645\u7684\u4f7f\u7528\u9700\u8981\u6839\u636e\u81ea\u8eab\u60c5\u51b5\u6765\u9009\u62e9\u3002\u4e14\u5de5\u4f5c\u961f\u5217\u8fd8\u6709\u5176\u4ed6\u7684\u7528\u6cd5\uff0c\u4f8b\u5982\u521b\u5efa\u4e00\u4e2a\u56fa\u5b9a\u5468\u671f\u8c03\u5ea6\u7684\u5de5\u4f5c\u961f\u5217\uff0c\u8fd9\u4e2a\u662ftasklet\u65e0\u6cd5\u505a\u5230\u7684\u3002
\n  \u5728\u8fd9\u91cc\u6211\u5f15\u7528\u522b\u4eba\u603b\u7ed3\u7684\u6bd4\u8f83\u76f4\u89c2\u7684\u4e00\u53e5\u8bdd\uff1a\u6211\u4eec\u5728\u505a\u9a71\u52a8\u7684\u65f6\u5019\uff0c\u5173\u4e8e\u8fd9\u4e09\u4e2a\u4e0b\u534a\u90e8(\u4e5f\u5c31\u662f\u4ee5\u4e0a\u7684\u4e09\u79cd\u673a\u5236)\u5b9e\u73b0\uff0c\u9700\u8981\u8003\u8651\u4e24\u70b9\uff1a\u9996\u5148\uff0c\u662f\u4e0d\u662f\u9700\u8981\u4e00\u4e2a\u53ef\u8c03\u5ea6\u7684\u5b9e\u4f53\u6765\u6267\u884c\u9700\u8981\u63a8\u540e\u5b8c\u6210\u7684\u5de5\u4f5c(\u5373\u4f11\u7720\u7684\u9700\u8981)\uff0c\u5982\u679c\u6709\uff0c\u5de5\u4f5c\u961f\u5217\u5c31\u662f\u552f\u4e00\u7684\u9009\u62e9\uff0c\u5426\u5219\u6700\u597d\u7528tasklet\u3002\u6027\u80fd\u5982\u679c\u662f\u6700\u91cd\u8981\u7684\uff0c\u90a3\u8fd8\u662f\u8f6f\u4e2d\u65ad\u5427\u3002
\n  \u5149\u770b\u7406\u8bba\u6ca1\u6709\u5b9e\u8df5\u8fd8\u662f\u4e0d\u61c2\uff0c\u8fd9\u662f\u6211\u5728lcd\u5c4f\u5e55\u4e2d\u89e6\u6478\u5c4f\u7684\u4e2d\u65ad\u4ee3\u7801\uff0c\u5c55\u793a\u4e86\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\u5bf9\u4e2d\u65ad\u5f97\u4f7f\u7528\u3002<\/p>\n
3.5.1 \u8bbe\u5907\u6811<\/h3>\n
  \u4e3a\u9632\u6b62\u6b67\u4e49\uff0c\u6211\u53ea\u4fdd\u7559\u4e86\u4e2d\u65ad\u76f8\u5173\u7684\u8bbe\u5907\u6811\u4fe1\u606f\u3002<\/p>\n
&spi0 {\n    #address-cells = <1>;\n    #size-cells = <0>;\n    tsc2046@0 {\n        pinctrl-names = \"default\";\n        pinctrl-0 = <&tp_irq>;\n\n        status = \"okay\";\n\n        compatible = \"ti,tsc2046\";\n        vcc-supply = <&ads7846reg1v8>;\n\n        spi-max-frequency = <1500000>;\n        reg = <0>;      \/* CS0 *\/\n\n        interrupt-parent = <&gpio3>;\n        interrupts = ;     \/* GPIO  *\/\n        pendown-gpio = <&gpio3 RK_PA7 GPIO_ACTIVE_HIGH>;\n\n        };\n};\n&pinctrl {\n    spi0 {\n       tp_irq:tp-irg {\n            rockchip,pins = <3 RK_PA7 RK_FUNC_GPIO &pcfg_pull_none>;\n           };\n    };\n};<\/code><\/pre>\n
3.5.2 \u9a71\u52a8\u6e90\u7801<\/h3>\n
  \u5982\u4e0b\u662f\u6211\u5f97\u4e2d\u65ad\u4ee3\u7801\u3002<\/p>\n
#include \n#include \n#include \n#include \n#include \n#include \n#include \n#include \n#include \n\n#define my_irq_name \"my_irq\"\n\nstruct device_node *node;\nunsigned int irqno;\n\nstruct my_touch_data\n{\n    struct spi_device *spi;\n    struct work_struct work;\n    void *private_data;         \/* \u79c1\u6709\u6570\u636e *\/\n};\n\nuint16_t touch_buf = 0;\nuint16_t value_re;\nstruct my_touch_data *data;\nvoid read_spi(struct my_touch_data *data,  uint8_t tcmd)\n{\n    \/**************************************************************\/\n    int ret;\n    unsigned char txdata;\n    struct spi_message m;\n    struct spi_transfer *t;\n    struct spi_device *spi = (struct spi_device *)data->private_data;\n\n    t = kzalloc(sizeof(struct spi_transfer), GFP_KERNEL);   \/* \u7533\u8bf7\u5185\u5b58 *\/\n\n    \/* \u7b2c1\u6b21\uff0c\u53d1\u9001\u8981\u8bfb\u53d6\u7684\u5bc4\u5b58\u5730\u5740 *\/\n    txdata = tcmd;\n    t->speed_hz = 5000000;\n    t->tx_buf = &txdata;            \/* \u8981\u53d1\u9001\u7684\u6570\u636e *\/\n    t->rx_buf = &touch_buf;         \/* \u8bfb\u53d6\u5230\u7684\u6570\u636e *\/\n    t->len = 1;                 \/* 1\u4e2a\u5b57\u8282 *\/\n    spi_message_init(&m);       \/* \u521d\u59cb\u5316spi_message *\/\n    spi_message_add_tail(t, &m);\/* \u5c06spi_transfer\u6dfb\u52a0\u5230spi_message\u961f\u5217 *\/\n    ret = spi_sync(spi, &m);    \/* \u540c\u6b65\u53d1\u9001 *\/\n\n    mdelay(1);\n\n    \/* \u7b2c2\u6b21\uff0c\u8bfb\u53d6\u6570\u636e *\/\n    txdata = 0x00;          \/* \u968f\u4fbf\u4e00\u4e2a\u503c\uff0c\u6b64\u5904\u65e0\u610f\u4e49 *\/\n    t->tx_buf = &txdata;\n    t->rx_buf = &touch_buf;         \/* \u8bfb\u53d6\u5230\u7684\u6570\u636e *\/\n    t->len = 1;             \/* \u8981\u8bfb\u53d6\u7684\u6570\u636e\u957f\u5ea6 *\/\n    spi_message_init(&m);       \/* \u521d\u59cb\u5316spi_message *\/\n    spi_message_add_tail(t, &m);\/* \u5c06spi_transfer\u6dfb\u52a0\u5230spi_message\u961f\u5217 *\/\n    ret = spi_sync(spi, &m);    \/* \u540c\u6b65\u53d1\u9001 *\/\n\n    value_re = touch_buf<<8;\n\n    \/* \u7b2c3\u6b21\uff0c\u8bfb\u53d6\u6570\u636e *\/\n    txdata = 0x00;          \/* \u968f\u4fbf\u4e00\u4e2a\u503c\uff0c\u6b64\u5904\u65e0\u610f\u4e49 *\/\n    t->tx_buf = &txdata;\n    t->rx_buf = &touch_buf;         \/* \u8bfb\u53d6\u5230\u7684\u6570\u636e *\/\n    t->len = 1;             \/* \u8981\u8bfb\u53d6\u7684\u6570\u636e\u957f\u5ea6 *\/\n    spi_message_init(&m);       \/* \u521d\u59cb\u5316spi_message *\/\n    spi_message_add_tail(t, &m);\/* \u5c06spi_transfer\u6dfb\u52a0\u5230spi_message\u961f\u5217 *\/\n    ret = spi_sync(spi, &m);    \/* \u540c\u6b65\u53d1\u9001 *\/\n\n    value_re |= touch_buf;\n    value_re >>= 3;\n\n    udelay(200);\n    kfree(t);                                   \/* \u91ca\u653e\u5185\u5b58 *\/\n    return value_re;\n}\n\n\/\/ \u5e95\u534a\u90e8\u5904\u7406\u51fd\u6570\nvoid irq_work_func(struct work_struct *mwork)\n{\n    printk(\"\u8fdb\u5165\u8f6f\u4e2d\u65ad\uff0c\u5de5\u4f5c\u961f\u5217\\n\");\n    disable_irq_nosync(irqno);\n    read_spi(data, 0xd0);\n    enable_irq(irqno);\n    disable_irq_nosync(irqno);\n    read_spi(data, 0x90);\n    enable_irq(irqno);\n} \n\/\/ \u4e2d\u65ad\u9876\u534a\u90e8\nirqreturn_t key_irq_handle(int irq, void *dev)\n{\n\n    printk(\"\u8fdb\u5165\u4e2d\u65ad\u4e0a\u534a\u90e8\\n\");\n    if (schedule_work(&data->work))\n    {\n        printk(\"\u8c03\u7528\u4e2d\u65ad\u4e0b\u534a\u90e8\u5b8c\u6210\\n\");\n    }else{\n        printk(\"\u8c03\u7528\u4e2d\u65ad\u4e0b\u534a\u90e8\u5931\u8d25\\n\");\n    }\n    return IRQ_HANDLED;\n}\nint my_touch_probe(struct spi_device *spi)\n{\n    int ret;\n    data = devm_kzalloc(&spi->dev, sizeof(struct my_touch_data), GFP_KERNEL);\n    if (!data)\n        return -ENOMEM;\n\n    \/*******************************************************************\/\n    \/\/ 0.tasklet_setup\u521d\u59cb\u5316\n    spi->mode = SPI_MODE_0; \/*MODE0\uff0cCPOL=0\uff0cCPHA=0*\/\n    spi->max_speed_hz = 5000000;\n    spi_setup(spi);\n    data->private_data = spi; \/* \u8bbe\u7f6e\u79c1\u6709\u6570\u636e *\/\n\n    INIT_WORK(&data->work, irq_work_func);\n\n    \/*******************\u6ce8\u518c\u4e2d\u65ad********************************\/\n    \/\/ 1.\u83b7\u53d6\u8bbe\u5907\u6811\u4e2d\u7684\u8282\u70b9\n    node = of_find_compatible_node(NULL, NULL, \"ti,tsc2046\");\n    if (node == NULL)\n    {\n        printk(\"get node error\\n\");\n        return -EINVAL;\n    }\n    printk(\"\u5339\u914d\u8bbe\u5907\u6811\u6210\u529f\\n\");\n\n    \/\/ 2.\u6620\u5c04\u5f97\u5230\u8f6f\u4e2d\u65ad\u53f7\n    irqno = irq_of_parse_and_map(node, 0);\n    if (irqno == 0)\n    {\n        printk(\"get irqno error\\n\");\n        return -EAGAIN;\n    }\n    printk(\"\u83b7\u53d6\u4e2d\u65ad\u53f7\u6210\u529f\\n\");\n    \/\/ 3.\u6ce8\u518c\u4e2d\u65ad\n    ret = devm_request_irq(&spi->dev, irqno, key_irq_handle,\n                           IRQF_TRIGGER_FALLING, my_irq_name, (void *)data);\n    if (ret)\n    {\n        printk(\"request irq error\\n\");\n        return ret;\n    }\n\n    printk(\"\u6ce8\u518c\u4e2d\u65ad\u6210\u529f\\n\");\n    \/******************\u4e2d\u65ad\u6ce8\u518c\u5b8c\u6210*******************************\/\n    return 0;\n}\n\nint my_touch_remove(struct spi_device *spi)\n{\n    cancel_work_sync(&data->work);\n    free_irq(irqno, 0);\n    return 0;\n}\n\nconst struct of_device_id of_match[] = {\n    {\n        .compatible = \"ti,tsc2046\",\n    },\n    {},\n};\nMODULE_DEVICE_TABLE(of, of_match);\n\nstruct spi_driver my_touch = {\n    .probe = my_touch_probe,\n    .remove = my_touch_remove,\n    .driver = {\n        .name = \"my_touch\",\n        .of_match_table = of_match,\n    },\n};\nmodule_spi_driver(my_touch);\nMODULE_LICENSE(\"GPL\");<\/code><\/pre>\n
3.5.3 \u6ce8\u610f\u4e8b\u9879<\/h3>\n
1.\u786c\u4e2d\u65ad\u4e2d\u4e0espi_sync\u7684\u51b2\u7a81
\n  \u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u9047\u5230\u4e86\u5f88\u591a\u95ee\u9898\u3002\u5982\u5728\u786c\u4e2d\u65ad\u4e2d\u8bfb\u53d6spi\u6570\u636e\u4f1a\u5bfc\u81f4\u5185\u6838\u5d29\u6e83\uff1b\u540e\u6765\u7814\u7a76\u53d1\u73b0\u539f\u6765\u786c\u4e2d\u65ad\u4e2d\u4e0d\u80fd\u963b\u585e\u7b49\u5f85\uff0c\u800cspi\u7684spi_sync\u51fd\u6570\u4f1a\u963b\u585e\u7b49\u5f85\u6570\u636e\u8fd4\u56de\uff0c\u8fd9\u4e8c\u8005\u4e00\u53e0\u52a0\u76f4\u63a5\u5bfc\u81f4\u5185\u6838\u5d29\u6e83\u3002
\n  \u5982\u660e\u660e\u6574\u4e2a\u4e2d\u65ad\u51fd\u6570\u5199\u7684\u6ca1\u95ee\u9898\uff0c\u4f46\u5c31\u662f\u4e0d\u80fd\u4ece\u786c\u4e2d\u65ad\u8c03\u7528\u8f6f\u4e2d\u65ad\u6210\u529f\uff1b\u8fd9\u662f\u56e0\u4e3a\u8f6f\u4e2d\u65ad\u4e2d\u5f97\u8c03\u7528\u51fd\u6570\u6709\u95ee\u9898\u5bfc\u81f4\u5f97\uff08\u6211\u8fd9\u91cc\u662f\u8bfb\u53d6spi\u6570\u636e\u5f97\u51fd\u6570\u534f\u8bae\u4e0d\u5bf9\u5bfc\u81f4\u5f97\uff09\u3002
\n  \u4e2d\u65ad\u8c03\u7528\u5931\u8d25\u7684\u95ee\u9898\u5f88\u5c34\u5c2c\uff0c\u4f46\u51e1\u8c03\u7528\u7684\u51fd\u6570\u6709\u4efb\u4f55\u9519\u8bef\u90fd\u4f1a\u5bfc\u81f4\u4e2d\u65ad\u8c03\u7528\u5931\u8d25\u3002\u8fd9\u79cd\u60c5\u51b5\u548c\u4ee5\u5f80\u7684\u7ecf\u9a8c\u4e0d\u540c\uff0c\u5373\u4f7f\u5931\u8d25\u8d77\u7801\u9519\u8bef\u4e4b\u524d\u7684\u51fd\u6570\u6267\u884c\u5b8c\u6210\u5e94\u8be5\u6253\u5370\u51fa\u4fe1\u606f\u5427\uff01\u4f46\u4e2d\u65ad\u7279\u6709\u7684\u673a\u5236\u5bfc\u81f4\uff0c\u4e0d\u4f1a\u6709\u4efb\u4f55\u6253\u5370\u4fe1\u606f\u51fa\u6765\uff0c\u53ea\u4f1a\u663e\u793a\u8c03\u7528\u5931\u8d25\u3002\u6ca1\u641e\u6e05\u695a\u8fd9\u4e2a\u95ee\u9898\u4e4b\u524d\uff0c\u4e00\u70b9\u4fe1\u606f\u4e0d\u6253\u5370\u4e00\u5ea6\u8ba9\u6211\u5f88\u61f5\u903c\u3002
\n2.\u4e2d\u65ad\u4e0espi\u901a\u4fe1\u7684\u51b2\u7a81
\n  \u5728\u4e0a\u8ff0\u95ee\u9898\u90fd\u89e3\u51b3\u540e\uff0c\u8ba9\u4eba\u61f5\u903c\u7684\u662f\u4e0d\u8fd4\u56de\u6b63\u786e\u6570\u636e\uff0c\u6052\u5b9a\u7684\u8fd4\u56de0xff\u30010x00\u30010xf8\uff1b\u4f46\u5404\u4e2a\u65b9\u9762\u90fd\u6ca1\u95ee\u9898\uff0c\u5bf9\u6bd4\u5185\u6838\u7684ads7846.c\u548c\u7f51\u4e0a\u7684xpt2046\u7684\u9a71\u52a8\u53d1\u73b0\u4e5f\u6ca1\u533a\u522b\uff0c\u4f46\u5c31\u662f\u4e0d\u8fd4\u56de\u6709\u6548\u6570\u636e\uff1b\u540e\u9762\u5c1d\u8bd5\u7528\u7ebf\u7a0b\u53d1\u9001\u8bfb\u53d6\u6570\u636e\uff0c\u5c31\u53ef\u6b63\u5e38\u8fd4\u56de\u3002\u6320\u7834\u5934\u76ae\u4e5f\u6ca1\u53d1\u73b0\u95ee\u9898\u5728\u54ea\uff0c\u673a\u7f18\u5de7\u5408\u4e0b\u7ed9\u4e2d\u65ad\u89e6\u53d1\u52a0\u4e86\u4e0b\u9762\u7684\u9501\u624d\u6b63\u5e38\u8fd4\u56de\u6570\u636e\u3002<\/p>\n
    disable_irq_nosync(irqno);\n    read_spi(data, 0x90);\n    enable_irq(irqno);<\/code><\/pre>\n
  \u5206\u6790\u89c9\u5f97\u95ee\u9898\u5e94\u8be5\u662f\u4e2d\u65ad\u4e0d\u65ad\u7684\u89e6\u53d1\uff0c\u800c\u5de5\u4f5c\u961f\u5217\u7684\u4e2d\u65ad\u662f\u521b\u5efa\u4e00\u7ec4\u7ebf\u7a0b\u6267\u884c\u4e2d\u65ad\u5185\u7684\u7a0b\u5e8f\u3002\u4e8c\u8005\u53e0\u52a0\u5bfc\u81f4\u4e00\u76f4\u5411\u89e6\u6478\u5c4f\u53d1\u9001\u8bfb\u53d6\u547d\u4ee4\uff0c\u6240\u4ee5\u624d\u65f6\u5e8f\u9519\u4e71\u65e0\u6cd5\u8fd4\u56de\u6709\u6548\u6570\u636e\u7684\u3002
\n3.\u9002\u914d\u5b98\u65b9\u7684ads7846.c\u9a71\u52a8\u7684\u95ee\u9898
\n  \u5728\u81ea\u5df1\u7684\u9a71\u52a8\u521d\u6b65\u8dd1\u901a\u540e\uff0c\u5c31\u51c6\u5907\u9002\u914d\u5b98\u65b9\u7684\u9a71\u52a8\uff1b\u7ed3\u679c\u53d1\u73b0\u600e\u4e48\u6d4b\u8bd5\u90fd\u5361\u5728\u4e2d\u65ad\u548cspi_sync\u51fd\u6570\u4e0a\u4e86\uff0c\u901a\u7bc7\u67e5\u4e0b\u6765\u4ee3\u7801\u5339\u914d\u6ca1\u4efb\u4f55\u95ee\u9898\u3002\u540e\u9762\u627e\u4e86\u4e2axpt2046\u7684\u9a71\u52a8\u4ee3\u7801\u4e5f\u662f\u5361\u5728\u8fd9\u91cc\uff0c\u6ca1\u529e\u6cd5\u9010\u884c\u8bfb\u4ee3\u7801\u5206\u6790\u95ee\u9898\u539f\u56e0\uff1b\u6700\u540e\u5206\u6790\u51fa\u539f\u56e0\u5e94\u8be5\u5c31\u662f\u4ee3\u7801\u4e2d\u5bf9\u6570\u636e\u5904\u7406\u7684\u95ee\u9898\uff0c\u5bfc\u81f4\u7ed9\u89e6\u6478\u5c4f\u53d1\u9001\u7684\u6570\u636e\u4e0d\u6b63\u5e38\uff0c\u4e14spi\u7684\u534f\u8bae\u4e5f\u6709\u4e00\u5b9a\u7684\u95ee\u9898\u624d\u5bfc\u81f4\u9002\u914d\u5b98\u65b9\u9a71\u52a8\u4e0d\u6210\u529f\u7684\u3002\u8003\u8651\u5230\u8fd9\u79cd\u6570\u636e\u5904\u7406\u95ee\u9898\u9700\u8981\u6d88\u8017\u7684\u7cbe\u529b\u548c\u65f6\u5e38\uff0c\u8fd8\u662f\u7528\u81ea\u5df1\u5199\u7684\u89e6\u6478\u9a71\u52a8\u6027\u4ef7\u6bd4\u9ad8\u4e00\u4e9b\u3002
\n  \u4f8b\u5982\uff1a
\n  \u4f7f\u7528spi\u5b50\u7cfb\u7edf\u4f20\u8f93\u65f6\u8bbe\u7f6e\u8fd4\u56de\u4e24\u4e2a\u5b57\u8282\u5c31\u4f1a\u53d1\u751f\u9519\u8bef\uff0c\u6211\u53ea\u80fd\u8001\u8001\u5b9e\u5b9e\u7684\u8fd4\u56de\u4e00\u4e2a\u5b57\u8282\u5355\u72ec\u5904\u7406\uff1b\u6211\u770b\u5404\u79cd\u4f8b\u7a0b\u90fd\u662f\u968f\u610f\u8bbe\u7f6e\u8fd4\u56de\u5b57\u8282\u6570\u7684\uff0c\u6240\u4ee5\u6211\u6000\u7591\u662fluckfox\u7684\u5f00\u53d1\u677f\u81ea\u8eab\u7684\u95ee\u9898\u3002<\/p>\n
    req->xfer[1].rx_buf = &req->sample;\n    req->xfer[1].len = 2;\n    spi_message_add_tail(&req->xfer[1], &req->msg);<\/code><\/pre>\n
4 \u603b\u7ed3<\/h1>\n
  \u81f3\u6b64\u5173\u4e8e\u4e2d\u65ad\u7684\u7406\u8bba\u4e0e\u5b9e\u8df5\u5c31\u90fd\u7814\u7a76\u7684\u5dee\u4e0d\u591a\u4e86\uff0c\u6574\u4f53\u4e0b\u6765\u6211\u89c9\u5f97\u5728\u9879\u76ee\u4e2d\u7b80\u5355\u5f97\u4f7f\u7528\u4e2d\u65ad\u662f\u6ca1\u4efb\u4f55\u95ee\u9898\u4e86\uff0c\u60f3\u518d\u6df1\u5165\u7814\u7a76\u5c31\u8981\u5206\u6790\u5185\u6838\u6e90\u7801\u4e86\uff0c\u67e5\u770b\u4e2d\u65ad\u5f97\u5e95\u5c42\u5b9e\u73b0\u3002\u5199\u5b8c\u4e86\u624d\u53d1\u73b0\u5b9a\u65f6\u5668\u4e2d\u65ad\u5fd8\u63d0\u4e86\uff0c\u6709\u9700\u8981\u5f97\u8bdd\uff0c\u540e\u7eed\u518d\u4e13\u95e8\u5199\u4e00\u7bc7\u3002\u8fd8\u6709\u6211\u5bf9\u9879\u76ee\u4e2d\u9047\u5230\u5f97\u95ee\u9898\u90fd\u53ea\u662f\u57fa\u4e8e\u73b0\u6709\u77e5\u8bc6\u5f97\u5224\u65ad\uff0c\u5982\u679c\u6709\u5927\u4f6c\u80fd\u7ed9\u51fa\u786e\u5207\u5f97\u7ed3\u8bba\u8fd8\u671b\u4e0d\u541d\u8d50\u6559\uff01\uff01\uff01\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
1. \u524d\u8a00   \u8fd9\u4e24\u5929\u505a\u9879\u76ee\u7528\u5230\u4e2d\u65ad\uff0c\u53d1\u73b0\u4ee5\u524d\u5b66\u7684\u90a3\u70b9\u4e1c\u897f\u90fd\u5fd8\u5149\u4e86\uff0c\u7d22\u6027\u5199\u4e2a\u7b14\u8bb0\u56de\u5fc6\u52a0\u5f3a\u4e00 […]<\/p>\n","protected":false},"author":1,"featured_media":310,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[34,38,37,33,11],"class_list":["post-376","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-flushbonading-lcd","tag-c-c","tag-38","tag-37","tag-33","tag-11"],"_links":{"self":[{"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=\/wp\/v2\/posts\/376","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=376"}],"version-history":[{"count":26,"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=\/wp\/v2\/posts\/376\/revisions"}],"predecessor-version":[{"id":438,"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=\/wp\/v2\/posts\/376\/revisions\/438"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=\/wp\/v2\/media\/310"}],"wp:attachment":[{"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=376"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=376"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yanwenkai.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=376"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}