#include <linux/module.h>
#include <asm/mach-types.h>
#include <linux/wm97xx.h>
#include <linux/timer.h>

static struct timer_list palmte2_batt_timer;
static int palmte2_batt_level;

static int palmte2_batt_probe(struct wm97xx* wm);
static int palmte2_batt_remove(struct device *dev);
static void palmte2_batt_update(unsigned long);

static int palmte2_probed = 0;

struct wm97xx_misc_dev palmte2_batt_dev = {
        .probe          = palmte2_batt_probe,
        .remove         = palmte2_batt_remove,
	.list		= LIST_HEAD_INIT(palmte2_batt_dev.list),
};

static int __init palmte2_batt_init(void)
{       
        if (!machine_is_tunge2())
                return -ENODEV;

        int ret = wm97xx_register_misc_dev(&palmte2_batt_dev);
	printk("palmte2_batt_init: returned %d\n", ret);
        return ret;
}

static void __exit palmte2_batt_exit(void)
{       
	wm97xx_unregister_misc_dev(&palmte2_batt_dev);
}

static int palmte2_batt_probe(struct wm97xx* wm)
{
        init_timer(&palmte2_batt_timer);
        palmte2_batt_timer.function = palmte2_batt_update;
        palmte2_batt_timer.data = (unsigned long)wm;
	palmte2_probed = 1;
        palmte2_batt_update(palmte2_batt_timer.data);
        return 0;
}

static int palmte2_batt_remove(struct device *dev)
{
        palmte2_probed = 0;
	del_timer_sync(&palmte2_batt_timer);
        return 0;
}


static void palmte2_batt_update(unsigned long data)
{
	if(palmte2_probed == 0) {
		printk("palmte2_batt_update: error: battery not probed yet!\n");
		return;
	}
	
        struct wm97xx *wm = (struct wm97xx*) data;

	if(wm == NULL) {
		printk("palmte2_batt_update: error: struct wm97xx* wm is null!\n");
		return;
	}

        palmte2_batt_level = wm97xx_read_aux_adc(wm, WM97XX_AUX_ID3);
	
        printk("palmte2_batt_update: new reading: %d\n", palmte2_batt_level);

        mod_timer(&palmte2_batt_timer, jiffies + HZ);
}

module_init(palmte2_batt_init)
module_exit(palmte2_batt_exit)

MODULE_AUTHOR("Jude Nelson <judecn@gmail.com>");
MODULE_DESCRIPTION("Battery driver for the Palm T|E2");
MODULE_LICENSE("GPL");