C180_oyster_driver/batteryled.c

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/device.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/i2c.h>
#include <linux/acpi.h>
#include <linux/interrupt.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/poll.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include "light_ring.h"


extern struct kobject *vfiec_kobj;
static struct kobject *batteryled_kobj;

static unsigned int led_charge_val = 0;
static unsigned int led_health_val = 0;


/* ==================== max_fade_brightness ==================== */
static ssize_t led_health_show(struct kobject *kobj,
                                        struct kobj_attribute *attr,
                                        char *buf)
{
    return sprintf(buf, "%u\n", led_health_val);
}

static ssize_t led_health_store(struct kobject *kobj,
                                         struct kobj_attribute *attr,
                                         const char *buf, size_t count)
{
    u32 val;
    int ret;

    ret = kstrtou32(buf, 10, &val);
    if (ret < 0)
        return ret;

    led_health_val = val;
    pr_info("batteryled: led_health_val %u\n", led_health_val);

    return count;
}

static struct kobj_attribute led_health =
    __ATTR(led_health, 0644, led_health_show, led_health_store);

/* ==================== mode ==================== */
static ssize_t led_charge_show(struct kobject *kobj, struct kobj_attribute *attr,
                         char *buf)
{
    const char *mode_str;

    return sprintf(buf, "%u\n", led_charge_val);
}

static ssize_t led_charge_store(struct kobject *kobj, struct kobj_attribute *attr,
                          const char *buf, size_t count)
{
    u32 val;
    int ret;

    ret = kstrtou32(buf, 10, &val);
    if (ret < 0)
        return ret;

    led_charge_val = val;
    pr_info("batteryled: led_charge_val %u\n", led_charge_val);

    return count;
}

static struct kobj_attribute led_charge =
    __ATTR(led_charge, 0644, led_charge_show, led_charge_store);

/* ==================== 属性组 ==================== */
static struct attribute *batteryled_attrs[] = {
    &led_charge.attr,
    &led_health.attr,
    NULL,
};

static struct attribute_group batteryled_attr_group = {
    .attrs = batteryled_attrs,
};

int batteryled_init(void)
{
    int ret;

        /* 创建 /sys/kernel/vfiec/batteryled */
    batteryled_kobj = kobject_create_and_add("batteryled", vfiec_kobj);
    if (!batteryled_kobj)
    {
        ret = -ENOMEM;
        return ret;
    }

    /* 创建属性文件 */
    ret = sysfs_create_group(batteryled_kobj, &batteryled_attr_group);
    if (ret)
    {
        pr_err("Failed to create sysfs group: %d\n", ret);
        goto free_batteryled_kobj;
    }
    return 0;

free_batteryled_kobj:
    kobject_put(batteryled_kobj);
    return ret;
}

void batteryled_exit(void)
{
    sysfs_remove_group(batteryled_kobj, &batteryled_attr_group);
    kobject_put(batteryled_kobj);
}