sonic-buildimage/platform/s3ip-sysfs/demo_driver/watchdog_device_driver.c

/*
 * watchdog_device_driver.c
 *
 * This module realize /sys/s3ip/watchdog attributes read and write functions
 *
 * History
 *  [Version]                [Date]                    [Description]
 *   *  v1.0                2021-08-31                  S3IP sysfs
 */

#include <linux/slab.h>

#include "device_driver_common.h"
#include "watchdog_sysfs.h"

#define WDT_INFO(fmt, args...) LOG_INFO("watchdog: ", fmt, ##args)
#define WDT_ERR(fmt, args...)  LOG_ERR("watchdog: ", fmt, ##args)
#define WDT_DBG(fmt, args...)  LOG_DBG("watchdog: ", fmt, ##args)

static int g_loglevel = 0;

/****************************************watchdog*********************************************/
/*
 * demo_get_watchdog_identify - Used to get watchdog identify, such as iTCO_wdt
 * @buf: Data receiving buffer
 * @count: length of buf
 *
 * This function returns the length of the filled buffer,
 * otherwise it returns a negative value on failed.
 */
static ssize_t demo_get_watchdog_identify(char *buf, size_t count)
{
    /* add vendor codes here */
    return -ENOSYS;
}

/*
 * demo_get_watchdog_timeleft - Used to get watchdog timeleft,
 * filled the value to buf
 * @buf: Data receiving buffer
 * @count: length of buf
 *
 * This function returns the length of the filled buffer,
 * otherwise it returns a negative value on failed.
 */
static ssize_t demo_get_watchdog_timeleft(char *buf, size_t count)
{
    /* add vendor codes here */
    return -ENOSYS;
}

/*
 * demo_get_watchdog_timeout - Used to get watchdog timeout,
 * filled the value to buf
 * @buf: Data receiving buffer
 * @count: length of buf
 *
 * This function returns the length of the filled buffer,
 * otherwise it returns a negative value on failed.
 */
static ssize_t demo_get_watchdog_timeout(char *buf, size_t count)
{
    /* add vendor codes here */
    return -ENOSYS;
}

/*
 * demo_set_watchdog_timeout - Used to set watchdog timeout,
 * @value: timeout value
 *
 * This function returns 0 on success,
 * otherwise it returns a negative value on failed.
 */
static int demo_set_watchdog_timeout(int value)
{
    /* add vendor codes here */
    return -ENOSYS;
}

/*
 * demo_get_watchdog_enable_status - Used to get watchdog enable status,
 * filled the value to buf, 0: disable, 1: enable
 * @buf: Data receiving buffer
 * @count: length of buf
 *
 * This function returns the length of the filled buffer,
 * otherwise it returns a negative value on failed.
 */
static ssize_t demo_get_watchdog_enable_status(char *buf, size_t count)
{
    /* add vendor codes here */
    return -ENOSYS;
}

/*
 * demo_set_watchdog_enable_status - Used to set watchdog enable status,
 * @value: enable status value, 0: disable, 1: enable
 *
 * This function returns 0 on success,
 * otherwise it returns a negative value on failed.
 */
static int demo_set_watchdog_enable_status(int value)
{
    /* add vendor codes here */
    return -ENOSYS;
}

/*
 * demo_get_watchdog_state - Used to get watchdog state,
 * filled the value to buf, 0: inactive, 1: active
 * @buf: Data receiving buffer
 * @count: length of buf
 *
 * This function returns the length of the filled buffer,
 * otherwise it returns a negative value on failed.
 */
static int demo_set_watchdog_reset(int value)
{
    /* add vendor codes here */
    return -ENOSYS;
}
/*************************************end of watchdog*****************************************/

static struct s3ip_sysfs_watchdog_drivers_s drivers = {
    /*
     * set ODM watchdog sensor drivers to /sys/s3ip/watchdog,
     * if not support the function, set corresponding hook to NULL.
     */
    .get_watchdog_identify = demo_get_watchdog_identify,
    .get_watchdog_timeleft = demo_get_watchdog_timeleft,
    .get_watchdog_timeout = demo_get_watchdog_timeout,
    .set_watchdog_timeout = demo_set_watchdog_timeout,
    .get_watchdog_enable_status = demo_get_watchdog_enable_status,
    .set_watchdog_enable_status = demo_set_watchdog_enable_status,
    .set_watchdog_reset = demo_set_watchdog_reset,
};

static int __init watchdog_dev_drv_init(void)
{
    int ret;

    WDT_INFO("watchdog_init...\n");

    ret = s3ip_sysfs_watchdog_drivers_register(&drivers);
    if (ret < 0) {
        WDT_ERR("watchdog drivers register err, ret %d.\n", ret);
        return ret;
    }
    WDT_INFO("watchdog create success.\n");
    return 0;
}

static void __exit watchdog_dev_drv_exit(void)
{
    s3ip_sysfs_watchdog_drivers_unregister();
    WDT_INFO("watchdog_exit success.\n");
    return;
}

module_init(watchdog_dev_drv_init);
module_exit(watchdog_dev_drv_exit);
module_param(g_loglevel, int, 0644);
MODULE_PARM_DESC(g_loglevel, "the log level(info=0x1, err=0x2, dbg=0x4, all=0xf).\n");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("sonic S3IP sysfs");
MODULE_DESCRIPTION("watchdog device driver");