sysfs

I want to pass a string > 1024 chars to my module (filesystem). As kernel parameters are limited to 1024 chars, someone recommended to use sysfs instead. I tried to include this example in my super.c class to create a string 'filename' & string 'code' entry in sysfs for my module. static decl_subsys(myfs, NULL, NULL); struct myfs_attr { struct attribute attr; char *value; }; static struct myfs_attr fname = { .attr.name="filename", .attr.owner = THIS_MODULE, .attr.mode = 0644, .value = "/my/test/path", }; static struct myfs_attr code = { .attr.name="code", .attr.owner = THIS_MODULE, .attr.mode

as the title states, I have a problem porting some userspace-interrupt code from another armv7 embedded linux platform onto the Raspberry Pi 2 Model B. I'm aware of the wiringPi library (and got it to work that way), but for evaluation reasons I want to do run as much identical code as possible on both platforms. For that reason I have to interface with sysfs by hand. So, here's the relevant code snippet #define GPIO_TRIGGER_MODE "rising" #define SYS_GPIO_PIN "2" #define SYS_GPIO_DIRECTION "/sys/class/gpio/gpio2/direction" #define SYS_GPIO_EDGE "/sys/class/gpio/gpio2/edge" #define SYS_GPIO

I am trying to create a sysfs for an implementation of mine in android and stuck at creating a folder of my own in CLASS . My requirement: /sys/class/example_class/my_sysfs_directory/file_one. Code: #include<linux/module.h> #include<linux/kernel.h> #include<linux/device.h> #include <linux/err.h> MODULE_LICENSE("GPL"); MODULE_AUTHOR("Manoj"); static ssize_t sysfs_demo_show(struct class *class, struct class_attribute *attr, char *buf) { pr_info("%s [%d]: \n", __func__, __LINE__); return sprintf(buf, "%s \n", __func__); } static ssize_t sysfs_demo_store(struct class *class, struct class_attribute