yaakov/scream-driver
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add a write fn

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Yaakov 2024-08-11 14:22:51 +10:00
parent d34c97192a
commit 252c5eaf2a
1 changed files with 10 additions and 1 deletions
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11
scream.c
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@ -20,10 +20,12 @@ static struct cdev scream_cdev;
static int scream_device_open(struct inode*, struct file*); static int scream_device_open(struct inode*, struct file*);
static int scream_device_release(struct inode*, struct file*); static int scream_device_release(struct inode*, struct file*);
static ssize_t scream_device_read(struct file*, char*, size_t, loff_t*); static ssize_t scream_device_read(struct file*, char*, size_t, loff_t*);
static ssize_t scream_device_write(struct file*, const char*, size_t, loff_t*);
static struct file_operations fops = { static struct file_operations fops = {
.open = scream_device_open, .open = scream_device_open,
.read = scream_device_read, .read = scream_device_read,
.write = scream_device_write,
.release = scream_device_release, .release = scream_device_release,
}; };
@ -50,7 +52,8 @@ static int __init scream_module_init(void) {
return PTR_ERR(scream_device); return PTR_ERR(scream_device);
} }
// Initialize the cdev structure and add it to the kernel printk(KERN_INFO "[scream] %s/%s device registered.", CLASS_NAME, DEVICE_NAME);
cdev_init(&scream_cdev, &fops); cdev_init(&scream_cdev, &fops);
int add_result = cdev_add(&scream_cdev, MKDEV(major_number, 0), 1); int add_result = cdev_add(&scream_cdev, MKDEV(major_number, 0), 1);
if (add_result < 0) { if (add_result < 0) {
@ -94,5 +97,11 @@ static ssize_t scream_device_read(struct file* file, char* __user user_buffer, s
return 0; return 0;
} }
static ssize_t scream_device_write(struct file* file, const char* __user user_buffer, size_t size, loff_t* offset)
{
printk(KERN_INFO "[scream] writing to device.\n");
return 0;
}
module_init(scream_module_init); module_init(scream_module_init);
module_exit(scream_module_exit); module_exit(scream_module_exit);