litmus-rt.git - The LITMUS^RT kernel.

/*
 * Driver for batteries with DS2760 chips inside.
 *
 * Copyright © 2007 Anton Vorontsov
 *	       2004-2007 Matt Reimer
 *	       2004 Szabolcs Gyurko
 *
 * Use consistent with the GNU GPL is permitted,
 * provided that this copyright notice is
 * preserved in its entirety in all copies and derived works.
 *
 * Author:  Anton Vorontsov <cbou@mail.ru>
 *	    February 2007
 *
 *	    Matt Reimer <mreimer@vpop.net>
 *	    April 2004, 2005, 2007
 *
 *	    Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>
 *	    September 2004
 */

#include <linux/module.h>
#include <linux/param.h>
#include <linux/jiffies.h>
#include <linux/workqueue.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>

#include "../w1/w1.h"
#include "../w1/slaves/w1_ds2760.h"

struct ds2760_device_info {
	struct device *dev;

	/* DS2760 data, valid after calling ds2760_battery_read_status() */
	unsigned long update_time;	/* jiffies when data read */
	char raw[DS2760_DATA_SIZE];	/* raw DS2760 data */
	int voltage_raw;		/* units of 4.88 mV */
	int voltage_uV;			/* units of µV */
	int current_raw;		/* units of 0.625 mA */
	int current_uA;			/* units of µA */
	int accum_current_raw;		/* units of 0.25 mAh */
	int accum_current_uAh;		/* units of µAh */
	int temp_raw;			/* units of 0.125 °C */
	int temp_C;			/* units of 0.1 °C */
	int rated_capacity;		/* units of µAh */
	int rem_capacity;		/* percentage */
	int full_active_uAh;		/* units of µAh */
	int empty_uAh;			/* units of µAh */
	int life_sec;			/* units of seconds */
	int charge_status;		/* POWER_SUPPLY_STATUS_* */

	int full_counter;
	struct power_supply bat;
	struct device *w1_dev;
	struct workqueue_struct *monitor_wqueue;
	struct delayed_work monitor_work;
	struct delayed_work set_charged_work;
};

static unsigned int cache_time = 1000;
module_param(cache_time, uint, 0644);
MODULE_PARM_DESC(cache_time, "cache time in milliseconds");

static bool pmod_enabled;
module_param(pmod_enabled, bool, 0644);
MODULE_PARM_DESC(pmod_enabled, "PMOD enable bit");

static unsigned int rated_capacity;
module_param(rated_capacity, uint, 0644);
MODULE_PARM_DESC(rated_capacity, "rated battery capacity, 10*mAh or index");

static unsigned int current_accum;
module_param(current_accum, uint, 0644);
MODULE_PARM_DESC(current_accum, "current accumulator value");

/* Some batteries have their rated capacity stored a N * 10 mAh, while
 * others use an index into this table. */
static int rated_capacities[] = {
	0,
	920,	/* Samsung */
	920,	/* BYD */
	920,	/* Lishen */
	920,	/* NEC */
	1440,	/* Samsung */
	1440,	/* BYD */
#ifdef CONFIG_MACH_H4700
	1800,	/* HP iPAQ hx4700 3.7V 1800mAh (359113-001) */
#else
	1440,	/* Lishen */
#endif
	1440,	/* NEC */
	2880,	/* Samsung */
	2880,	/* BYD */
	2880,	/* Lishen */
	2880,	/* NEC */
#ifdef CONFIG_MACH_H4700
	0,
	3600,	/* HP iPAQ hx4700 3.7V 3600mAh (359114-001) */
#endif
};

/* array is level at temps 0°C, 10°C, 20°C, 30°C, 40°C
 * temp is in Celsius */
static int battery_interpolate(int array[], int temp)
{
	int index, dt;

	if (temp <= 0)
		return array[0];
	if (temp >= 40)
		return array[4];

	index = temp / 10;
	dt    = temp % 10;

	return array[index] + (((array[index + 1] - array[index]) * dt) / 10);


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