// hdgl_lattice_sysfs.c
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/kobject.h>
#include <linux/sysfs.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
#include <linux/spinlock.h>
#include <linux/io.h>

#define LATTICE_SIZE 32
#define LATTICE_PHYS_ADDR 0x100000
#define STEP_INTERVAL_MS 50   // lattice step interval

static void __iomem *lattice_virt;
static struct kobject *hdgl_kobj;
static struct timer_list lattice_timer;
static spinlock_t lattice_lock;

/* -------------------------
 * Lattice Step Function
 * ------------------------- */
static void hdgl_step(struct timer_list *t){
    unsigned long flags;
    spin_lock_irqsave(&lattice_lock, flags);

    double D[LATTICE_SIZE];
    size_t i;
    for(i=0;i<LATTICE_SIZE;i++)
        D[i] = ioread64(lattice_virt + i*sizeof(double));

    // Simple superposition step (example)
    for(i=0;i<LATTICE_SIZE;i++){
        double res = 0;
        if(i>0) res += D[i-1];
        if(i<LATTICE_SIZE-1) res += D[i+1];
        D[i] = tanh(D[i] + 0.05 * (D[i]*1.618 + res));
        iowrite64(D[i], lattice_virt + i*sizeof(double));
    }

    spin_unlock_irqrestore(&lattice_lock, flags);

    mod_timer(&lattice_timer, jiffies + msecs_to_jiffies(STEP_INTERVAL_MS));
}

/* -------------------------
 * Sysfs Slot Access
 * ------------------------- */
static ssize_t slot_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf){
    unsigned long flags;
    ssize_t ret;
    int idx;
    if(sscanf(attr->attr.name, "D%d", &idx)!=1 || idx<1 || idx>LATTICE_SIZE) return -EINVAL;

    spin_lock_irqsave(&lattice_lock, flags);
    ret = sprintf(buf, "%lf\n", ioread64(lattice_virt + (idx-1)*sizeof(double)));
    spin_unlock_irqrestore(&lattice_lock, flags);

    return ret;
}

static ssize_t slot_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count){
    unsigned long flags;
    int idx;
    double val;
    if(sscanf(attr->attr.name, "D%d", &idx)!=1 || idx<1 || idx>LATTICE_SIZE) return -EINVAL;
    if(kstrtod(buf, 10, &val)) return -EINVAL;

    spin_lock_irqsave(&lattice_lock, flags);
    iowrite64(val, lattice_virt + (idx-1)*sizeof(double));
    spin_unlock_irqrestore(&lattice_lock, flags);

    return count;
}

/* Create attribute structures dynamically */
static struct kobj_attribute slot_attrs[LATTICE_SIZE];

static int hdgl_create_sysfs(void){
    int i;
    hdgl_kobj = kobject_create_and_add("hdgl_lattice", kernel_kobj);
    if(!hdgl_kobj) return -ENOMEM;

    for(i=0;i<LATTICE_SIZE;i++){
        char name[8];
        snprintf(name, sizeof(name), "D%d", i+1);
        sysfs_attr_init(&slot_attrs[i].attr);
        slot_attrs[i].attr.name = kstrdup(name, GFP_KERNEL);
        slot_attrs[i].attr.mode = 0664;
        slot_attrs[i].show = slot_show;
        slot_attrs[i].store = slot_store;
        if(sysfs_create_file(hdgl_kobj, &slot_attrs[i].attr)){
            printk(KERN_ALERT "HDGL: Failed to create %s\n", name);
        }
    }
    return 0;
}

/* -------------------------
 * Module Init/Exit
 * ------------------------- */
static int __init hdgl_init(void){
    int ret;
    spin_lock_init(&lattice_lock);

    lattice_virt = ioremap(LATTICE_PHYS_ADDR, LATTICE_SIZE*sizeof(double));
    if(!lattice_virt) return -ENOMEM;

    ret = hdgl_create_sysfs();
    if(ret) {
        iounmap(lattice_virt);
        return ret;
    }

    timer_setup(&lattice_timer, hdgl_step, 0);
    mod_timer(&lattice_timer, jiffies + msecs_to_jiffies(STEP_INTERVAL_MS));

    printk(KERN_INFO "HDGL: Lattice Sysfs Module Loaded\n");
    return 0;
}

static void __exit hdgl_exit(void){
    del_timer_sync(&lattice_timer);
    kobject_put(hdgl_kobj);
    iounmap(lattice_virt);
    printk(KERN_INFO "HDGL: Lattice Sysfs Module Unloaded\n");
}

module_init(hdgl_init);
module_exit(hdgl_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("HDGL Team");
MODULE_DESCRIPTION("HDGL Lattice Kernel Module with Sysfs and Auto-Step");
MODULE_VERSION("1.0");
