https:\/\/infoarts.tistory.com\/21<\/a><\/p>\n\n\n\n\ub3cc\uace0 \ub3cc\uc544 \uc7a5\uce58\ub97c \ucd94\uac00\ud558\uace0, \uc778\ud130\ub7fd\ud2b8\ub97c \ub9cc\ub4e4\uc5b4 softirq\ub97c \uc2e4\ud589\ud588\ub2e4. tutorial site\uc5d0 \uc798 \uc124\uba85\ub418\uc5b4 \uc788\ub2e4. \ub098\uc911\uc5d0 \ub514\ubc14\uc774\uc2a4 read, write\ub97c \uc778\ud130\ub7fd\ud2b8\ub85c \uc124\uc815\ud560 \uc218\ub3c4 \uc788\uc744 \ub4ef \ud558\ub2e4.<\/p>\n\n\n\n
i@raspberrypi:~\/RaspberryDebug\/my_driver $ cat Makefile\nobj-m := my_driver.o\n#obj-m := sample_driver.o\nall:\n\tmake -C \/lib\/modules\/`uname -r`\/build M=`pwd` modules\nclean:\n\trm *.o *.ko *.mod *.mod.c *.mod.o\n<\/pre>\n\n\n\n#include <linux\/module.h>\n#include <linux\/kernel.h>\n#include <linux\/init.h>\n#include <linux\/irq.h>\n#include <linux\/interrupt.h>\n#include <linux\/gpio.h> \/\/GPIO\n\n#include <linux\/fs.h>\n#include <linux\/cdev.h>\n#include <linux\/device.h>\n\n#define GPIO_10_OUT (10)\nunsigned int GPIO_irqNumber;\n\n\/\/softirq handler\nstatic void pesudo_interrupt_softirq_handler(struct softirq_action *action)\n{\n\tpr_info(\"pesudo interreupt occured\\n\");\n}\n\n\nstatic irqreturn_t gpio_irq_handler(int irq, void *dev_id)\n{\n\t\/* Raise the softirq *\/\n\traise_softirq(TEST_SOFT_IRQ);\n\treturn IRQ_HANDLED;\n\n}\n\n\n\/\/device driver \\uc791\\uc131 \\ubd80\\ubd84.\n\/*************\\ub4dc\\ub77c\\uc774\\ubc84 \\ud568\\uc218 ******************\/\nstatic int mydriver_open(struct inode *inode, struct file *file);\nstatic int mydriver_release(struct inode *inode, struct file *file);\nstatic ssize_t mydriver_read(struct file *flip,\n\t\tchar *buf, size_t len, loff_t *off);\nstatic ssize_t mydriver_write(struct file *flip,\n\t\tconst char *buf, size_t len, loff_t *off);\n\/********************************************\/\n\n\n\/\/file operation structure\n\nstatic struct file_operations fops = \n{\n\t.owner = THIS_MODULE,\n\t.read = mydriver_read,\n\t.write = mydriver_write,\n\t.open = mydriver_open,\n\t.release = mydriver_release,\n};\n\nstatic int mydriver_open(struct inode *inode, struct file *file)\n{\n\tpr_info(\"Deviced file was opend.\\n\");\n\treturn 0;\n\n}\n\nstatic int mydriver_release(struct inode *inode, struct file *file)\n{\n\treturn 0;\n}\n\n\nstatic int mydriver_read(struct file *flip,\n\t\tchar *buf, size_t len, loff_t *off)\n{\n\n\treturn 0;\n}\n\nstatic int mydriver_write(struct file *flip,\n\t\tconst char *buf, size_t len, loff_t *off)\n{\n\treturn 0;\n\n}\n\ndev_t dev = 0;\nstatic struct cdev my_cdev;\nstatic struct class *dev_class;\n\nstatic int __init init_hw(void)\n{\n\t\/\/\\ub514\\ubc14\\uc774\\uc2a4 \\ub4f1\\ub85d\n\tif(( alloc_chrdev_region(&dev, 0, 1, \"test_device\") < 0))\n\t{\n\t\tpr_err(\"[!]character device was not allocated\\n\");\n\t\tgoto r_unreg;\n\n\t}\n\tpr_info(\"[=]%d-%d, was allocated\\n\", MAJOR(dev), MINOR(dev));\n\n\n\t\/\/\\ucd08\\uae30\\ud654\n\tcdev_init(&my_cdev, &fops);\n\tpr_info(\"[=]driver was initialized\\n\");\n\t\n\n\t\/\/\\uc2dc\\uc2a4\\ud15c\\uc5d0 \\ucd94\\uac00\n\tif((cdev_add(&my_cdev, dev, 1)) < 0)\n\t{\n\t\tpr_err(\"[!]cannot add device to kernel\\n\");\n\t\tgoto r_del;\n\n\t}\n\n\n\t\/\/class \\ub9cc\\ub4e6.\n\tif((dev_class=class_create(THIS_MODULE, \"my_class\")) == NULL)\n\t{\n\t\tpr_err(\"[!]cannot add class\\n\");\n\t\tgoto r_class;\n\t}\n\n\n\tif((device_create(dev_class, NULL, dev, NULL, \"my_device\")) == NULL)\n\t{\n\n\t\tpr_err(\"[!]cannot create device\\n\");\n\t\tgoto r_device;\n\t}\n\t\n\t\/\/gpio 10\\ubc88\\uc744 \\uc0ac\\uc6a9.\n\t\/\/export\\ud558\\uc5ec \\uac04\\ub2e8\\ud788 \\uc0ac\\uc6a9.\n\t\/\/\\uc785\\ub825\\uc740 \\uac12\\uc744 \\uc368 \\ub123\\uc744 \\uc218 \\uc5c6\\uc74c. \\ucd9c\\ub825\\uc73c\\ub85c \\uc124\\uc815.\n\tGPIO_irqNumber = gpio_to_irq(GPIO_10_OUT);\n\tpr_info(\"[=]irq %d was assinged\\n\",GPIO_irqNumber);\n\t\n\t\/\/interrupt \\ub4f1\\ub85d \\ud544\\uc694\n\tif (request_irq(GPIO_irqNumber,\n\t\t\t\t(void*)gpio_irq_handler,\n\t\t\t\tIRQF_TRIGGER_RISING,\n\t\t\t\t\"my_device\",\n\t\t\t\tNULL))\n\t{\n\t\tpr_err(\"[!]my_device: cannot register IRQ\\n\");\n\t\tgoto r_gpio;\n\t}\n\t\n\topen_softirq(TEST_SOFT_IRQ, pesudo_interrupt_softirq_handler);\n\tpr_info(\"[=]module was installed\\n\");\n\treturn 0;\nr_gpio:\n\tgpio_free(GPIO_10_OUT);\nr_device:\n\tdevice_destroy(dev_class,dev);\n\nr_class:\n\tclass_destroy(dev_class);\nr_del:\n\tcdev_del(&my_cdev);\nr_unreg:\n\tunregister_chrdev_region(dev,1);\n\nreturn -1;\n}\n\nstatic void __exit exit_hw(void) {\n\tdevice_destroy(dev_class,dev);\n\tclass_destroy(dev_class);\n\tcdev_del(&my_cdev);\n\tunregister_chrdev_region(dev,1);\n\tprintk(KERN_INFO \"module was removed\\n\");\n}\n\n\nmodule_init(init_hw);\nmodule_exit(exit_hw);\nMODULE_LICENSE(\"GPL\");\nMODULE_AUTHOR(\"Eunseong Park (esp-ark.com)\");\nMODULE_DESCRIPTION(\"Hello, world!\");\n<\/pre>\n\n\n\npi@raspberrypi:~\/RaspberryDebug\/my_driver $ echo \"10\" > \/sys\/class\/gpio\/export\npi@raspberrypi:~\/RaspberryDebug\/my_driver $ echo \"out\" > \/sys\/class\/gpio\/gpio10\/direction \npi@raspberrypi:~\/RaspberryDebug\/my_driver $ gpio read 10\n1\npi@raspberrypi:~\/RaspberryDebug\/my_driver $ echo 0 > \/sys\/class\/gpio\/gpio10\/value ; echo 1 > \/sys\/class\/gpio\/gpio10\/value;\npi@raspberrypi:~\/RaspberryDebug\/my_driver $ echo 0 > \/sys\/class\/gpio\/gpio10\/value ; echo 1 > \/sys\/class\/gpio\/gpio10\/value;\npi@raspberrypi:~\/RaspberryDebug\/my_driver $ echo 0 > \/sys\/class\/gpio\/gpio10\/value ; echo 1 > \/sys\/class\/gpio\/gpio10\/value;\n<\/pre>\n\n\n\n[ 281.496011] my_driver: loading out-of-tree module taints kernel.\n[ 281.496218] my_driver: no symbol version for raise_softirq\n[ 281.496487] [=]236-0, was allocated\n[ 281.496492] [=]driver was initialized\n[ 281.496679] [=]irq 54 was assinged\n[ 281.496713] [=]module was installed\n[ 439.643072] pesudo interreupt occured\npi@raspberrypi:\/sys\/class\/gpio $ dmesg | tail -10;cat \/proc\/softirqs \n[ 21.513881] input: Keyboard K480 Consumer Control as \/devices\/platform\/soc\/fe201000.serial\/tty\/ttyAMA0\/hci0\/hci0:11\/0005:046D:B33C.0003\/input\/input5\n[ 21.514017] input: Keyboard K480 System Control as \/devices\/platform\/soc\/fe201000.serial\/tty\/ttyAMA0\/hci0\/hci0:11\/0005:046D:B33C.0003\/input\/input6\n[ 21.514160] hid-generic 0005:046D:B33C.0003: input,hidraw2: BLUETOOTH HID v28.02 Keyboard [Keyboard K480] on e4:5f:01:06:e9:01\n[ 281.496011] my_driver: loading out-of-tree module taints kernel.\n[ 281.496218] my_driver: no symbol version for raise_softirq\n[ 281.496487] [=]236-0, was allocated\n[ 281.496492] [=]driver was initialized\n[ 281.496679] [=]irq 54 was assinged\n[ 281.496713] [=]module was installed\n[ 439.643072] pesudo interreupt occured\n CPU0 CPU1 CPU2 CPU3 \n HI: 1 0 0 0\n TIMER: 18713 21705 20854 19911\n NET_TX: 95 49 315 19\n NET_RX: 1125 324 1051 398\n BLOCK: 0 0 0 0\n IRQ_POLL: 0 0 0 0\n TASKLET: 44263 453 587 288\n SCHED: 17064 20646 19843 18418\n HRTIMER: 0 0 0 0\n RCU: 19242 23191 20816 20212\n (null): 1 0 0 0\npi@raspberrypi:\/sys\/class\/gpio $ dmesg | tail -10;cat \/proc\/softirqs \n[ 21.514017] input: Keyboard K480 System Control as \/devices\/platform\/soc\/fe201000.serial\/tty\/ttyAMA0\/hci0\/hci0:11\/0005:046D:B33C.0003\/input\/input6\n[ 21.514160] hid-generic 0005:046D:B33C.0003: input,hidraw2: BLUETOOTH HID v28.02 Keyboard [Keyboard K480] on e4:5f:01:06:e9:01\n[ 281.496011] my_driver: loading out-of-tree module taints kernel.\n[ 281.496218] my_driver: no symbol version for raise_softirq\n[ 281.496487] [=]236-0, was allocated\n[ 281.496492] [=]driver was initialized\n[ 281.496679] [=]irq 54 was assinged\n[ 281.496713] [=]module was installed\n[ 439.643072] pesudo interreupt occured\n[ 471.316929] pesudo interreupt occured\n CPU0 CPU1 CPU2 CPU3 \n HI: 1 0 0 0\n TIMER: 18828 21849 21047 20104\n NET_TX: 95 49 321 19\n NET_RX: 1125 324 1063 398\n BLOCK: 0 0 0 0\n IRQ_POLL: 0 0 0 0\n TASKLET: 44459 453 609 288\n SCHED: 17173 20815 20069 18623\n HRTIMER: 0 0 0 0\n RCU: 19350 23343 20917 20386\n (null): 2 0 0 0\npi@raspberrypi:\/sys\/class\/gpio $ dmesg | tail -10;cat \/proc\/softirqs \n[ 21.514160] hid-generic 0005:046D:B33C.0003: input,hidraw2: BLUETOOTH HID v28.02 Keyboard [Keyboard K480] on e4:5f:01:06:e9:01\n[ 281.496011] my_driver: loading out-of-tree module taints kernel.\n[ 281.496218] my_driver: no symbol version for raise_softirq\n[ 281.496487] [=]236-0, was allocated\n[ 281.496492] [=]driver was initialized\n[ 281.496679] [=]irq 54 was assinged\n[ 281.496713] [=]module was installed\n[ 439.643072] pesudo interreupt occured\n[ 471.316929] pesudo interreupt occured\n[ 477.954727] pesudo interreupt occured\n CPU0 CPU1 CPU2 CPU3 \n HI: 1 0 0 0\n TIMER: 18963 22041 21297 20379\n NET_TX: 95 50 325 19\n NET_RX: 1128 326 1068 409\n BLOCK: 0 0 0 0\n IRQ_POLL: 0 0 0 0\n TASKLET: 44749 453 647 288\n SCHED: 17324 21034 20344 18910\n HRTIMER: 0 0 0 0\n RCU: 19496 23548 21158 20547\n (null): 3 0 0 0\npi@raspberrypi:\/sys\/class\/gpio $ sudo rmmod my_driver \npi@raspberrypi:\/sys\/class\/gpio $ dmesg | tail -10;cat \/proc\/softirqs \n[ 281.496011] my_driver: loading out-of-tree module taints kernel.\n[ 281.496218] my_driver: no symbol version for raise_softirq\n[ 281.496487] [=]236-0, was allocated\n[ 281.496492] [=]driver was initialized\n[ 281.496679] [=]irq 54 was assinged\n[ 281.496713] [=]module was installed\n[ 439.643072] pesudo interreupt occured\n[ 471.316929] pesudo interreupt occured\n[ 477.954727] pesudo interreupt occured\n[ 497.174610] module was removed\n CPU0 CPU1 CPU2 CPU3 \n HI: 1 0 0 0\n TIMER: 19416 22394 21661 20809\n NET_TX: 95 50 335 19\n NET_RX: 1141 331 1087 409\n BLOCK: 0 0 0 0\n IRQ_POLL: 0 0 0 0\n TASKLET: 45416 479 678 288\n SCHED: 17800 21462 20753 19347\n HRTIMER: 0 0 0 0\n RCU: 19908 23925 21541 20832\n (null): 3 0 0 0<\/pre>\n\n\n\npi@raspberrypi:\/sys\/class\/gpio $ cat \/proc\/interrupts \n CPU0 CPU1 CPU2 CPU3 \n 17: 0 0 0 0 GICv2 29 Level arch_timer\n 18: 13237 9026 7126 13623 GICv2 30 Level arch_timer\n 23: 352 0 0 0 GICv2 114 Level DMA IRQ\n 31: 3111 0 0 0 GICv2 65 Level fe00b880.mailbox\n 34: 8655 0 0 0 GICv2 153 Level uart-pl011\n 35: 0 0 0 0 GICv2 169 Level brcmstb_thermal\n 36: 33671 0 0 0 GICv2 158 Level mmc1, mmc0\n 37: 17923 0 0 0 GICv2 144 Level vc4 firmware kms\n 38: 0 0 0 0 GICv2 48 Level arm-pmu\n 39: 0 0 0 0 GICv2 49 Level arm-pmu\n 40: 0 0 0 0 GICv2 50 Level arm-pmu\n 41: 0 0 0 0 GICv2 51 Level arm-pmu\n 42: 8559 0 0 0 GICv2 106 Level v3d\n 44: 1557 0 0 0 GICv2 189 Level eth0\n 45: 52 0 0 0 GICv2 190 Level eth0\n 51: 707 0 0 0 GICv2 66 Level VCHIQ doorbell\n 52: 0 0 0 0 GICv2 175 Level PCIe PME, aerdrv\n 53: 1053 0 0 0 Brcm_MSI 524288 Edge xhci_hcd\n 54: 2 0 0 0 pinctrl-bcm2835 10 Edge my_device\nIPI0: 0 0 0 0 CPU wakeup interrupts\nIPI1: 0 0 0 0 Timer broadcast interrupts\nIPI2: 12130 21051 27290 15651 Rescheduling interrupts\nIPI3: 785 1597 1554 1937 Function call interrupts\nIPI4: 0 0 0 0 CPU stop interrupts\nIPI5: 793 414 433 246 IRQ work interrupts\nIPI6: 0 0 0 0 completion interrupts\nErr: 0\n<\/pre>\n\n\n\n\uc790 \uc774\uc81c \ucee4\ub110\uc744 \ub2e4\uc2dc \ub3cc\ub9ac\uace0 tasklet\uc73c\ub85c \uac00\uc790. \ub4dc\ub77c\uc774\ubc84\ub97c \uc5b8\ub85c\ub529\ud558\uace0 cat \/proc\/interrupt\ub97c \ud558\uba74 \uc2dc\uc2a4\ud15c\uc774 \uc5b4\uca43\ub4e0 \uc8fd\ub294\ub2e4.<\/s> softirq \ubb38\uc81c\uac00 \uc544\ub2c8\ub77c, \uc778\ud130\ub7fd\ud2b8 \ud578\ub4e4\ub7ec\ub97c \ud574\uc81c\ud558\uc9c0 \uc54a\uc544\uc11c \uc8fd\uc5c8\ub2e4.<\/p>\n\n\n\npi@raspberrypi:~\/RaspberryDebug\/my_driver $ diff my_driver.c my_driver.c.bak\n164d163\n< \tfree_irq(GPIO_irqNumber, NULL);\n<\/pre>\n","protected":false},"excerpt":{"rendered":"\uc778\ud130\ub7fd\ud2b8 \ud6c4\ubc18\ubd80\ub97c \ucc98\ub9ac\ud558\ub294 soft irq\ub97c \ubc30\uc6e0\ub2e4. \uc790 \uc774\uc81c \uc0ac\uc6a9\ud574 \ubcf4\uc790. \ubd88\ud589\ud788\ub3c4 \uc694\uc998\uc740 \uc77c\ubc18\ud654\ub41c tasklet\uc744 \uc0ac\uc6a9\ud558\uace0 low level\uc778 soft irq\ub97c \uc0ac\uc6a9\ud558\uc9c0 […]<\/p>\n","protected":false},"author":1,"featured_media":4676,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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