path: root/drivers/power/pm2301_charger.c

/*
 * Copyright 2012 ST Ericsson.
 *
 * Power supply driver for ST Ericsson pm2xxx_charger charger
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/completion.h>
#include <linux/regulator/consumer.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/workqueue.h>
#include <linux/kobject.h>
#include <linux/mfd/abx500.h>
#include <linux/mfd/abx500/ab8500.h>
#include <linux/mfd/abx500/ab8500-bm.h>
#include <linux/mfd/abx500/ab8500-gpadc.h>
#include <linux/mfd/abx500/ux500_chargalg.h>
#include <linux/pm2301_charger.h>
#include <linux/gpio.h>

#include "pm2301_charger.h"

#define to_pm2xxx_charger_ac_device_info(x) container_of((x), \
		struct pm2xxx_charger, ac_chg)

static int pm2xxx_interrupt_registers[] = {
	PM2XXX_REG_INT1,
	PM2XXX_REG_INT2,
	PM2XXX_REG_INT3,
	PM2XXX_REG_INT4,
	PM2XXX_REG_INT5,
	PM2XXX_REG_INT6,
};

static enum power_supply_property pm2xxx_charger_ac_props[] = {
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_VOLTAGE_AVG,
};

static int pm2xxx_charger_voltage_map[] = {
	3500,
	3525,
	3550,
	3575,
	3600,
	3625,
	3650,
	3675,
	3700,
	3725,
	3750,
	3775,
	3800,
	3825,
	3850,
	3875,
	3900,
	3925,
	3950,
	3975,
	4000,
	4025,
	4050,
	4075,
	4100,
	4125,
	4150,
	4175,
	4200,
	4225,
	4250,
	4275,
	4300,
};

static int pm2xxx_charger_current_map[] = {
	200,
	200,
	400,
	600,
	800,
	1000,
	1200,
	1400,
	1600,
	1800,
	2000,
	2200,
	2400,
	2600,
	2800,
	3000,
};

static const struct i2c_device_id pm2xxx_ident[] = {
	{ "pm2301", 0 },
	{ }
};

static void set_lpn_pin(struct pm2xxx_charger *pm2)
{
	if (pm2->ac.charger_connected)
		return;
	gpio_set_value(pm2->lpn_pin, 1);

	return;
}

static void clear_lpn_pin(struct pm2xxx_charger *pm2)
{
	if (pm2->ac.charger_connected)
		return;
	gpio_set_value(pm2->lpn_pin, 0);

	return;
}

static int pm2xxx_reg_read(struct pm2xxx_charger *pm2, int reg, u8 *val)
{
	int ret;
	/*
	 * When AC adaptor is unplugged, the host
	 * must put LPN high to be able to
	 * communicate by I2C with PM2301
	 * and receive I2C "acknowledge" from PM2301.
	 */
	mutex_lock(&pm2->lock);
	set_lpn_pin(pm2);

	ret = i2c_smbus_read_i2c_block_data(pm2->config.pm2xxx_i2c, reg,
				1, val);
	if (ret < 0)
		dev_err(pm2->dev, "Error reading register at 0x%x\n", reg);
	else
		ret = 0;
	clear_lpn_pin(pm2);
	mutex_unlock(&pm2->lock);

	return ret;
}

static int pm2xxx_reg_write(struct pm2xxx_charger *pm2, int reg, u8 val)
{
	int ret;
	/*
	 * When AC adaptor is unplugged, the host
	 * must put LPN high to be able to
	 * communicate by I2C with PM2301
	 * and receive I2C "acknowledge" from PM2301.
	 */
	mutex_lock(&pm2->lock);
	set_lpn_pin(pm2);

	ret = i2c_smbus_write_i2c_block_data(pm2->config.pm2xxx_i2c, reg,
				1, &val);
	if (ret < 0)
		dev_err(pm2->dev, "Error writing register at 0x%x\n", reg);
	else
		ret = 0;
	clear_lpn_pin(pm2);
	mutex_unlock(&pm2->lock);

	return ret;
}

static int pm2xxx_charging_enable_mngt(struct pm2xxx_charger *pm2)
{
	int ret;

	/* Enable charging */
	ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG2,
			(