├── LICENSE ├── README.md ├── depmod-export-sym-demo ├── CommonHeader.h ├── Makefile ├── moduleone.c └── moduletwo.c ├── get-vendor-device-id-usb ├── Makefile └── vendor.c ├── helloworld ├── Makefile ├── Readme └── hello.c ├── isr-sample ├── Makefile ├── Readme └── sampleisr.c ├── passingargs ├── Makefile └── passargs.c ├── sample-char-dir ├── Makefile ├── application │ └── app.c ├── library-style │ ├── appusing-library │ │ └── appusinglib.c │ ├── mylib.c │ ├── mylib.h │ └── sharedlib-commands ├── sampledrv.c ├── sampledrv.h └── sampleioctl.h └── sample-platform-driver ├── Makefile ├── platform-sample.h ├── preparedev.c └── preparedrv.c /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. 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Of course, the commands you use may 322 | be called something other than `show w' and `show c'; they could even be 323 | mouse-clicks or menu items--whatever suits your program. 324 | 325 | You should also get your employer (if you work as a programmer) or your 326 | school, if any, to sign a "copyright disclaimer" for the program, if 327 | necessary. Here is a sample; alter the names: 328 | 329 | Yoyodyne, Inc., hereby disclaims all copyright interest in the program 330 | `Gnomovision' (which makes passes at compilers) written by James Hacker. 331 | 332 | {signature of Ty Coon}, 1 April 1989 333 | Ty Coon, President of Vice 334 | 335 | This General Public License does not permit incorporating your program into 336 | proprietary programs. If your program is a subroutine library, you may 337 | consider it more useful to permit linking proprietary applications with the 338 | library. If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | kernel-module-programming(Under Editing) 2 | ========================= 3 | 4 | Index 5 | ===== 6 | 7 | 1. Hello World Module 8 | 9 | 2. Passing aruguments 10 | 11 | 3. Module Dependency 12 | 13 | 4. Sample Char Driver - Basic Calculator 14 | 15 | 4.1 Accessing driver directly using ioctl() 16 | 17 | 4.2 Accessing through dynamic library(.so) 18 | 19 | 5. Platform drivers 20 | -------------------------------------------------------------------------------- /depmod-export-sym-demo/CommonHeader.h: -------------------------------------------------------------------------------- 1 | #ifndef __COMMON_HEADER__ 2 | #define __COMMON_HEADER__ 3 | 4 | int sample1func(void); 5 | #endif 6 | -------------------------------------------------------------------------------- /depmod-export-sym-demo/Makefile: -------------------------------------------------------------------------------- 1 | obj-m += moduleone.o 2 | obj-m += moduletwo.o 3 | 4 | all: 5 | make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules 6 | sudo cp *.ko /lib/modules/$(shell uname -r)/ 7 | sudo depmod -a 8 | 9 | clean: 10 | make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean 11 | sudo rm /lib/modules/$(shell uname -r)/moduleone.ko 12 | sudo rm /lib/modules/$(shell uname -r)/moduletwo.ko 13 | sudo depmod -a 14 | -------------------------------------------------------------------------------- /depmod-export-sym-demo/moduleone.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | 4 | #include "CommonHeader.h" 5 | 6 | MODULE_LICENSE("GPL"); 7 | 8 | int __init ourinitmodule(void) 9 | { 10 | printk(KERN_ALERT "\n sample -1 init.... \n"); 11 | return 0; 12 | } 13 | 14 | void __exit ourcleanupmodule(void) 15 | { 16 | printk(KERN_ALERT "\n sample -1 Exit.... \n"); 17 | } 18 | 19 | int sample1func() 20 | { 21 | printk(KERN_ALERT "\n sample -1 Exported Function .... \n"); 22 | return 0; 23 | } 24 | EXPORT_SYMBOL(sample1func); 25 | 26 | module_init(ourinitmodule); 27 | module_exit(ourcleanupmodule); 28 | -------------------------------------------------------------------------------- /depmod-export-sym-demo/moduletwo.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | 4 | #include "CommonHeader.h" 5 | 6 | MODULE_LICENSE("GPL"); 7 | 8 | int __init ourinitmodule(void) 9 | { 10 | printk(KERN_ALERT "\n sample -2 init.... \n"); 11 | /* Making two.c to depend on one.c */ 12 | sample1func(); 13 | return 0; 14 | } 15 | 16 | void __exit ourcleanupmodule(void) 17 | { 18 | printk(KERN_ALERT "\n sample -2 Exit.... \n"); 19 | } 20 | 21 | module_init(ourinitmodule); 22 | module_exit(ourcleanupmodule); 23 | -------------------------------------------------------------------------------- /get-vendor-device-id-usb/Makefile: -------------------------------------------------------------------------------- 1 | obj-m += vendor.o 2 | 3 | all: 4 | make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules 5 | 6 | clean: 7 | make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean 8 | -------------------------------------------------------------------------------- /get-vendor-device-id-usb/vendor.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include 5 | #include 6 | #include 7 | 8 | MODULE_LICENSE("GPL"); 9 | 10 | int ourinitmodule(void) 11 | { 12 | int chix = 0; 13 | struct usb_device *dev, *childdev = NULL; 14 | struct usb_bus *bus = NULL; 15 | 16 | list_for_each_entry(bus, &usb_bus_list, bus_list) 17 | { 18 | printk(KERN_ALERT "\n USB Bus : %d", bus->busnum); 19 | dev = bus->root_hub; 20 | printk(KERN_ALERT "\n Vendor Id:%x, Product Id:%x\n", \ 21 | dev->descriptor.idVendor, dev->descriptor.idProduct); 22 | 23 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,0) 24 | usb_hub_for_each_child(dev, chix, childdev) 25 | { 26 | if(childdev) 27 | { 28 | printk("\n Vendor Id:%x, Product Id:%x\n",\ 29 | childdev->descriptor.idVendor,\ 30 | childdev->descriptor.idProduct); 31 | } 32 | } 33 | #endif 34 | } 35 | return 0; 36 | } 37 | void ourcleanupmodule(void) 38 | { 39 | printk(KERN_ALERT "\n Thanks....Exiting USB Application. \n"); 40 | } 41 | module_init(ourinitmodule); 42 | module_exit(ourcleanupmodule); 43 | -------------------------------------------------------------------------------- /helloworld/Makefile: -------------------------------------------------------------------------------- 1 | TARGET ?= hello 2 | 3 | obj-m += $(TARGET).o 4 | 5 | all: 6 | make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules 7 | @echo "" 8 | @echo "$(TARGET).ko Module created" 9 | 10 | clean: 11 | make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean 12 | 13 | load: 14 | sudo insmod $(PWD)/$(TARGET).ko 15 | @echo "$(TARGET) Module Loaded: check dmesg for details" 16 | 17 | unload: 18 | sudo rmmod $(TARGET) 19 | @echo "$(TARGET) Module unloaded: check dmesg for details" 20 | -------------------------------------------------------------------------------- /helloworld/Readme: -------------------------------------------------------------------------------- 1 | A sample kernel module program: 2 | 3 | Steps to compile and run 4 | 5 | 1. To compile use: $make 6 | 2. To load the module use: $make load 7 | 3. To unload the module use: $make unload 8 | 4. To clean use: $make clean 9 | -------------------------------------------------------------------------------- /helloworld/hello.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | 4 | MODULE_LICENSE("GPL"); 5 | 6 | int __init ourinitmodule(void) 7 | { 8 | printk(KERN_ALERT "\n Welcome to sample application.... \n"); 9 | return 0; 10 | } 11 | 12 | void __exit ourcleanupmodule(void) 13 | { 14 | printk(KERN_ALERT "\n Thanks....Exiting Application. \n"); 15 | } 16 | 17 | module_init(ourinitmodule); 18 | module_exit(ourcleanupmodule); 19 | -------------------------------------------------------------------------------- /isr-sample/Makefile: -------------------------------------------------------------------------------- 1 | TARGET ?= sampleisr 2 | 3 | obj-m += $(TARGET).o 4 | 5 | all: 6 | make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules 7 | @echo "" 8 | @echo "$(TARGET).ko Module created" 9 | 10 | clean: 11 | make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean 12 | 13 | load: 14 | sudo insmod $(PWD)/$(TARGET).ko 15 | @echo "$(TARGET) Module Loaded: check dmesg for details" 16 | 17 | unload: 18 | sudo rmmod $(TARGET) 19 | @echo "$(TARGET) Module unloaded: check dmesg for details" 20 | -------------------------------------------------------------------------------- /isr-sample/Readme: -------------------------------------------------------------------------------- 1 | A sample kernel module program: 2 | 3 | Steps to compile and run 4 | 5 | 1. To compile use: $make 6 | 2. To load the module use: $make load 7 | 3. To unload the module use: $make unload 8 | 4. To clean use: $make clean 9 | -------------------------------------------------------------------------------- /isr-sample/sampleisr.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | 5 | MODULE_LICENSE("GPL"); 6 | int flag = 1; 7 | 8 | //Fake device. 9 | int tempdev = 0; 10 | 11 | irqreturn_t sampleISR(int irq, void *dev_id) 12 | { 13 | printk(KERN_ALERT "\n My ISR Called. \n"); 14 | 15 | /* To allow actual device to handle it's interrupt. */ 16 | return IRQ_NONE; 17 | } 18 | 19 | int __init ourinitmodule(void) 20 | { 21 | printk(KERN_ALERT "\n Welcome to sample application.... \n"); 22 | 23 | if(request_irq(21, sampleISR, IRQF_SHARED, KBUILD_MODNAME, (void*)&tempdev)) 24 | { 25 | printk("\n Error in isr registration. \n"); 26 | flag = 0; 27 | } 28 | return 0; 29 | } 30 | 31 | void __exit ourcleanupmodule(void) 32 | { 33 | if(flag) 34 | free_irq(21, (void*)&tempdev); 35 | printk(KERN_ALERT "\n Thanks....Exiting Application. \n"); 36 | } 37 | 38 | module_init(ourinitmodule); 39 | module_exit(ourcleanupmodule); 40 | -------------------------------------------------------------------------------- /passingargs/Makefile: -------------------------------------------------------------------------------- 1 | obj-m += passargs.o 2 | 3 | all: 4 | make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules 5 | 6 | clean: 7 | make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean 8 | -------------------------------------------------------------------------------- /passingargs/passargs.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | /* Added for module_param */ 4 | #include 5 | 6 | MODULE_LICENSE("GPL"); 7 | 8 | /* Module param : Integer data */ 9 | static int data; 10 | module_param(data, int, S_IRUSR|S_IWUSR); 11 | 12 | /* Module param : String data */ 13 | static char *mystr = "Default"; 14 | module_param(mystr, charp, 0); 15 | 16 | /* Module param : Integer Array data */ 17 | static int myarray[10] = {-1}; 18 | static int count = 0; 19 | module_param_array(myarray, int,&count, 0); 20 | 21 | int ourinitmodule(void) 22 | { 23 | int tmp = 0; 24 | 25 | /* Print data - Default values will be printed if No argument is passed. */ 26 | printk(KERN_ALERT "\n Demo for Passing arguments to kernel module \n"); 27 | printk(KERN_ALERT "\n data:%d\n", data); 28 | printk(KERN_ALERT "\n mystr:%s\n", mystr); 29 | 30 | for(tmp = 0; tmp < count ; tmp++) 31 | printk(KERN_ALERT "\n myarray[%d]:%d", tmp, myarray[tmp]); 32 | 33 | return 0; 34 | } 35 | 36 | void ourcleanupmodule(void) 37 | { 38 | printk(KERN_ALERT "\n Thanks....Exiting Passing args sample.. \n"); 39 | } 40 | 41 | module_init(ourinitmodule); 42 | module_exit(ourcleanupmodule); 43 | -------------------------------------------------------------------------------- /sample-char-dir/Makefile: -------------------------------------------------------------------------------- 1 | obj-m += sampledrv.o 2 | 3 | all: 4 | make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules 5 | 6 | clean: 7 | make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean 8 | -------------------------------------------------------------------------------- /sample-char-dir/application/app.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include 5 | 6 | #include "../sampleioctl.h" 7 | 8 | int main() 9 | { 10 | struct calc dat; 11 | int opt; 12 | int fd, err=0; 13 | 14 | fd = open("/dev/samplechar", O_RDWR); 15 | if(fd < 0) 16 | { 17 | perror("open:"); 18 | return -1; 19 | } 20 | 21 | while(1) 22 | { 23 | printf("\n 1.Add\n2.Sub\n3.Mul\n4.Div\n \ 24 | 5.ExitApp\nChoose Operation:" ); 25 | scanf("%d", &opt); 26 | 27 | if(opt == 5) 28 | break; 29 | 30 | if(opt < 1 || opt > 4) 31 | { 32 | printf("\n Invalid Option... "); 33 | continue; 34 | } 35 | 36 | printf("\n Enter Data1:"); 37 | scanf("%d", &dat.data1); 38 | 39 | printf("\n Enter Data2:"); 40 | scanf("%d", &dat.data2); 41 | 42 | switch(opt) 43 | { 44 | case 1: 45 | err=ioctl(fd, SAMPLE_IOCTL_ADD, &dat); 46 | break; 47 | 48 | case 2: 49 | err=ioctl(fd, SAMPLE_IOCTL_SUB, &dat); 50 | break; 51 | case 3: 52 | err=ioctl(fd, SAMPLE_IOCTL_MUL, &dat); 53 | break; 54 | case 4: 55 | err= ioctl(fd, SAMPLE_IOCTL_DIV, &dat); 56 | break; 57 | } 58 | printf("\n Result is :%d", dat.result); 59 | } 60 | 61 | close(fd); 62 | return 0; 63 | } 64 | -------------------------------------------------------------------------------- /sample-char-dir/library-style/appusing-library/appusinglib.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include 5 | 6 | #include "../mylib.h" 7 | 8 | int main() 9 | { 10 | int data1, data2; 11 | int opt; 12 | int err=0; 13 | 14 | err = OpenDev(); 15 | if(err < 0) 16 | { 17 | printf("\n open: Error in file open... "); 18 | return -1; 19 | } 20 | 21 | while(1) 22 | { 23 | printf("\n 1.Add\n2.Sub\n3.Mul\n4.Div\n \ 24 | 5.ExitApp\nChoose Operation:" ); 25 | scanf("%d", &opt); 26 | 27 | if(opt == 5) 28 | break; 29 | 30 | if(opt < 1 || opt > 4) 31 | { 32 | printf("\n Invalid Option... "); 33 | continue; 34 | } 35 | 36 | printf("\n Enter Data1:"); 37 | scanf("%d", &data1); 38 | printf("\n Enter Data2:"); 39 | scanf("%d", &data2); 40 | 41 | switch(opt) 42 | { 43 | case 1: 44 | err = Add(data1, data2); 45 | break; 46 | case 2: 47 | err=Sub(data1, data2); 48 | break; 49 | case 3: 50 | err= Mul(data1, data2); 51 | break; 52 | case 4: 53 | err= Div(data1, data2); 54 | break; 55 | } 56 | printf("\n Result is :%d", err); 57 | } 58 | 59 | CloseDev(); 60 | return 0; 61 | } 62 | -------------------------------------------------------------------------------- /sample-char-dir/library-style/mylib.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include 5 | #include 6 | 7 | #include "../sampleioctl.h" 8 | #include "mylib.h" 9 | 10 | int fd; 11 | struct calc dat; 12 | 13 | int OpenDev() 14 | { 15 | fd = open("/dev/samplechar", O_RDWR); 16 | if(fd < 0) 17 | { 18 | perror("open:"); 19 | return -1; 20 | } 21 | return 0; 22 | } 23 | 24 | int Add(int data1, int data2) 25 | { 26 | int err=0; 27 | 28 | dat.data1 = data1; 29 | dat.data2 = data2; 30 | 31 | err=ioctl(fd, SAMPLE_IOCTL_ADD, &dat); 32 | if(err < 0) 33 | { 34 | perror("ioctl:"); 35 | return -1; 36 | } 37 | return dat.result; 38 | } 39 | 40 | int Sub(int data1, int data2) 41 | { 42 | int err=0; 43 | 44 | dat.data1 = data1; 45 | dat.data2 = data2; 46 | 47 | err=ioctl(fd, SAMPLE_IOCTL_SUB, &dat); 48 | if(err < 0) 49 | { 50 | perror("ioctl:"); 51 | return -1; 52 | } 53 | return dat.result; 54 | } 55 | 56 | int Mul(int data1, int data2) 57 | { 58 | int err=0; 59 | 60 | dat.data1 = data1; 61 | dat.data2 = data2; 62 | 63 | err=ioctl(fd, SAMPLE_IOCTL_MUL, &dat);if(err < 0) 64 | { 65 | perror("ioctl:"); 66 | return -1; 67 | } 68 | return dat.result; 69 | } 70 | int Div(int data1, int data2) 71 | { 72 | int err=0; 73 | 74 | dat.data1 = data1; 75 | dat.data2 = data2; 76 | 77 | err= ioctl(fd, SAMPLE_IOCTL_DIV, &dat); 78 | if(err < 0) 79 | { 80 | perror("ioctl:"); 81 | return -1; 82 | } 83 | return dat.result; 84 | } 85 | 86 | int CloseDev() 87 | { 88 | close(fd); 89 | return 0; 90 | } 91 | -------------------------------------------------------------------------------- /sample-char-dir/library-style/mylib.h: -------------------------------------------------------------------------------- 1 | #ifndef __MY_LIB___ 2 | #define __MY_LIB___ 3 | 4 | int OpenDev(); 5 | int Add(int data1, int data2); 6 | int Sub(int data1, int data2); 7 | int Mul(int data1, int data2); 8 | int Div(int data1, int data2); 9 | int CloseDev(); 10 | 11 | #endif 12 | -------------------------------------------------------------------------------- /sample-char-dir/library-style/sharedlib-commands: -------------------------------------------------------------------------------- 1 | gcc -fPIC -g -c -Wall mylib.c 2 | gcc -shared -W1,-soname, -o libmylib.so mylib.o -lc 3 | -------------------------------------------------------------------------------- /sample-char-dir/sampledrv.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include 5 | #include 6 | #include 7 | 8 | #include "sampledrv.h" 9 | #include "sampleioctl.h" 10 | 11 | MODULE_LICENSE("GPL"); 12 | static int major; 13 | 14 | static const struct file_operations sample_fops = { 15 | .owner = THIS_MODULE, 16 | .unlocked_ioctl = sample_ioctl, 17 | .open = sample_open, 18 | .release = sample_close 19 | }; 20 | 21 | int ourinitmodule(void) 22 | { 23 | major = register_chrdev(MAJOR_DYNAMIC, DRV_NAME, &sample_fops); 24 | /* major = register_chrdev(MAJOR_HARDCODE, DRV_NAME, &sample_fops);*/ 25 | if (major < 0) { 26 | printk(KERN_ERR "%s: couldn't get a major number.\n", DRV_NAME); 27 | return major; 28 | } 29 | 30 | return 0; 31 | } 32 | 33 | void ourcleanupmodule(void) 34 | { 35 | unregister_chrdev(major, DRV_NAME); 36 | printk(KERN_ALERT "\n Thanks....exiting sample driver \n"); 37 | } 38 | 39 | static long sample_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 40 | { 41 | switch(cmd) 42 | { 43 | case SAMPLE_IOCTL_ADD: 44 | { 45 | struct calc addition; 46 | memset(&addition, 0, sizeof(struct calc)); 47 | if (copy_from_user(&addition, (struct calc*)arg,\ 48 | sizeof(struct calc))) 49 | return -EFAULT; 50 | 51 | addition.result = addition.data1 + addition.data2; 52 | if (copy_to_user((struct calc*)arg, &addition,\ 53 | sizeof(struct calc))) 54 | return -EFAULT; 55 | printk(KERN_ALERT "\n Kernel :: Add . \n"); 56 | return 0; 57 | } 58 | 59 | case SAMPLE_IOCTL_SUB: 60 | { 61 | struct calc sub; 62 | memset(&sub, 0, sizeof(struct calc)); 63 | if (copy_from_user(&sub, (struct calc*)arg,\ 64 | sizeof(struct calc))) 65 | return -EFAULT; 66 | sub.result = sub.data1 - sub.data2; 67 | if (copy_to_user((struct calc*)arg, &sub,\ 68 | sizeof(struct calc))) 69 | return -EFAULT; 70 | printk(KERN_ALERT "\n Kernel :: Sub . \n"); 71 | return 0; 72 | } 73 | 74 | case SAMPLE_IOCTL_MUL: 75 | { 76 | struct calc mul; 77 | memset(&mul, 0, sizeof(struct calc)); 78 | if (copy_from_user(&mul, (struct calc*)arg,\ 79 | sizeof(struct calc))) 80 | return -EFAULT; 81 | 82 | mul.result = mul.data1 * mul.data2; 83 | if (copy_to_user((struct calc*)arg, &mul,\ 84 | sizeof(struct calc))) 85 | return -EFAULT; 86 | 87 | printk(KERN_ALERT "\n Kernel :: MUL . \n"); 88 | return 0; 89 | } 90 | 91 | case SAMPLE_IOCTL_DIV: 92 | { 93 | struct calc div; 94 | memset(&div, 0, sizeof(struct calc)); 95 | if (copy_from_user(&div, (struct calc*)arg,\ 96 | sizeof(struct calc))) 97 | return -EFAULT; 98 | 99 | if(div.data2 == 0) 100 | return 0; 101 | 102 | div.result = div.data1 / div.data2; 103 | if (copy_to_user((struct calc*)arg, &div,\ 104 | sizeof(struct calc))) 105 | return -EFAULT; 106 | printk(KERN_ALERT "\n Kernel :: Div . \n"); 107 | return 0; 108 | } 109 | default: 110 | return -EINVAL; 111 | } 112 | } 113 | 114 | static int sample_open(struct inode *inode, struct file *filp) 115 | { 116 | printk(KERN_ALERT "\n sample_open called \n"); 117 | return 0; 118 | } 119 | 120 | static int sample_close(struct inode *inode, struct file *filp) 121 | { 122 | printk(KERN_ALERT "\n sample_close called \n"); 123 | return 0; 124 | } 125 | 126 | module_init(ourinitmodule); 127 | module_exit(ourcleanupmodule); 128 | -------------------------------------------------------------------------------- /sample-char-dir/sampledrv.h: -------------------------------------------------------------------------------- 1 | #ifndef __SAM_CHAR_DRV__ 2 | #define __SAM_CHAR_DRV__ 3 | 4 | #define DRV_NAME "samplechar" 5 | 6 | #define MAJOR_DYNAMIC 0 7 | #define MAJOR_HARDCODE 189 8 | 9 | static long sample_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 10 | static int sample_open(struct inode *inode, struct file *filp); 11 | static int sample_close(struct inode *inode, struct file *filp); 12 | 13 | #endif 14 | -------------------------------------------------------------------------------- /sample-char-dir/sampleioctl.h: -------------------------------------------------------------------------------- 1 | #ifndef __SAMPLE_IOCTL_H__ 2 | #define __SAMPLE_IOCTL_H__ 3 | 4 | struct calc 5 | { 6 | int data1; 7 | int data2; 8 | int result; 9 | }; 10 | 11 | #define SAMPLE_MAGIC 'p' 12 | #define SAMPLE_IOCTL_ADD _IOWR(SAMPLE_MAGIC, 0x01, struct calc) 13 | #define SAMPLE_IOCTL_SUB _IOWR(SAMPLE_MAGIC, 0x02, struct calc) 14 | #define SAMPLE_IOCTL_DIV _IOWR(SAMPLE_MAGIC, 0x03, struct calc) 15 | #define SAMPLE_IOCTL_MUL _IOWR(SAMPLE_MAGIC, 0x04, struct calc) 16 | 17 | #endif 18 | -------------------------------------------------------------------------------- /sample-platform-driver/Makefile: -------------------------------------------------------------------------------- 1 | obj-m += preparedev.o 2 | obj-m += preparedrv.o 3 | 4 | all: 5 | make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules 6 | 7 | clean: 8 | make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean 9 | -------------------------------------------------------------------------------- /sample-platform-driver/platform-sample.h: -------------------------------------------------------------------------------- 1 | #ifndef __SAMPLE_PLATFORM_H 2 | #define __SAMPLE_PLATFORM_H 3 | 4 | #define DRIVER_NAME "Sample_Pldrv" 5 | 6 | /* These Addresses defined by the Hardware Designer... 7 | Simply added to demostrate.*/ 8 | #define RESOURCE1_START_ADDRESS 0x100000 9 | #define RESOURCE1_END_ADDRESS 0x1FFFFF 10 | 11 | #define RESOURCE2_START_ADDRESS 0x300000 12 | #define RESOURCE2_END_ADDRESS 0x3FFFFF 13 | 14 | #define SAMPLE_DEV_IRQNUM 6 15 | 16 | #endif 17 | -------------------------------------------------------------------------------- /sample-platform-driver/preparedev.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | //For platform drivers.... 4 | #include 5 | 6 | #include "platform-sample.h" 7 | 8 | MODULE_LICENSE("GPL"); 9 | 10 | /* Specifying my resources information */ 11 | static struct resource sample_resources[] = { 12 | { 13 | .start = RESOURCE1_START_ADDRESS, 14 | .end = RESOURCE1_END_ADDRESS, 15 | .flags = IORESOURCE_MEM, 16 | }, 17 | { 18 | .start = RESOURCE2_START_ADDRESS, 19 | .end = RESOURCE2_END_ADDRESS, 20 | .flags = IORESOURCE_MEM, 21 | }, 22 | { 23 | .start = SAMPLE_DEV_IRQNUM, 24 | .end = SAMPLE_DEV_IRQNUM, 25 | .flags = IORESOURCE_IRQ, 26 | } 27 | 28 | }; 29 | 30 | 31 | static struct platform_device sample_device = { 32 | .name = DRIVER_NAME, 33 | .id = -1, 34 | .num_resources = ARRAY_SIZE(sample_resources), 35 | .resource = sample_resources, 36 | }; 37 | 38 | int ourinitmodule(void) 39 | { 40 | printk(KERN_ALERT "\n Welcome to sample Platform driver(device).... \n"); 41 | platform_device_register(&sample_device); 42 | return 0; 43 | } 44 | 45 | void ourcleanupmodule(void) 46 | { 47 | platform_device_unregister(&sample_device); 48 | printk(KERN_ALERT "\n Thanks....Exiting sample Platform(device) driver... \n"); 49 | } 50 | 51 | module_init(ourinitmodule); 52 | module_exit(ourcleanupmodule); 53 | -------------------------------------------------------------------------------- /sample-platform-driver/preparedrv.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | //for platform drivers.... 4 | #include 5 | 6 | #include "platform-sample.h" 7 | 8 | MODULE_LICENSE("GPL"); 9 | 10 | static int sample_drv_probe(struct platform_device *pdev) 11 | { 12 | 13 | struct resource *res1, *res2; 14 | 15 | res1 = platform_get_resource(pdev, IORESOURCE_MEM, 1); 16 | if (unlikely(!res1)) { 17 | pr_err(" Specified Resource Not Available... 1\n"); 18 | return -1; 19 | } 20 | 21 | printk(KERN_ALERT "\n Memory Area1\n"); 22 | printk(KERN_ALERT "Start:%x, End:%x Size:%d\n", (unsigned long)res1->start, (unsigned long)res1->end, resource_size(res1)); 23 | 24 | /* 25 | //Converting the physical Address to virtual for using in driver 26 | reg1 = ioremap_nocache(res1->start, resource_size(res1)); 27 | if (unlikely(!reg1)) { 28 | printk(KERN_ALERT " (cannot map IO)\n"); 29 | return; 30 | } 31 | */ 32 | 33 | res2 = platform_get_resource(pdev, IORESOURCE_MEM, 1); 34 | if (unlikely(!res2)) { 35 | pr_err(" Specified Resource Not Available... 2\n"); 36 | return -1; 37 | } 38 | 39 | printk(KERN_ALERT "\n Memory Area2\n"); 40 | printk(KERN_ALERT "Start:%x, End:%x, size:%d\n", (unsigned long)res2->start, (unsigned long)res2->end, resource_size(res2)); 41 | 42 | /* 43 | //Converting the physical Address to virtual for using in driver 44 | reg2 = ioremap_nocache(res2->start, resource_size(res2)); 45 | if (unlikely(!reg2)) { 46 | printk(KERN_ALERT " (cannot map IO)\n"); 47 | return; 48 | } 49 | */ 50 | 51 | printk(KERN_ALERT "\n IRQ Number of Device :%d\n", platform_get_irq(pdev, 0)); 52 | return 0; 53 | } 54 | 55 | static int sample_drv_remove(struct platform_device *pdev) 56 | { 57 | return 0; 58 | } 59 | 60 | static struct platform_driver sample_pldriver = { 61 | .probe = sample_drv_probe, 62 | .remove = sample_drv_remove, 63 | .driver = { 64 | .name = DRIVER_NAME, 65 | }, 66 | }; 67 | 68 | int ourinitmodule(void) 69 | { 70 | printk(KERN_ALERT "\n Welcome to sample Platform driver.... \n"); 71 | platform_driver_register(&sample_pldriver); 72 | return 0; 73 | } 74 | 75 | void ourcleanupmodule(void) 76 | { 77 | platform_driver_unregister(&sample_pldriver); 78 | printk(KERN_ALERT "\n Thanks....Exiting sample Platform driver... \n"); 79 | return; 80 | } 81 | 82 | module_init(ourinitmodule); 83 | module_exit(ourcleanupmodule); 84 | --------------------------------------------------------------------------------