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|
/*
* Battery driver for Marvell 88PM860x PMIC
*
* Copyright (c) 2012 Marvell International Ltd.
* Author: Jett Zhou <jtzhou@marvell.com>
* Haojian Zhuang <haojian.zhuang@marvell.com>
*
* 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/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/power_supply.h>
#include <linux/mfd/88pm860x.h>
#include <linux/delay.h>
#include <linux/uaccess.h>
#include <asm/div64.h>
/* bit definitions of Status Query Interface 2 */
#define STATUS2_CHG (1 << 2)
/* bit definitions of Reset Out Register */
#define RESET_SW_PD (1 << 7)
/* bit definitions of PreReg 1 */
#define PREREG1_90MA (0x0)
#define PREREG1_180MA (0x1)
#define PREREG1_450MA (0x4)
#define PREREG1_540MA (0x5)
#define PREREG1_1350MA (0xE)
#define PREREG1_VSYS_4_5V (3 << 4)
/* bit definitions of Charger Control 1 Register */
#define CC1_MODE_OFF (0)
#define CC1_MODE_PRECHARGE (1)
#define CC1_MODE_FASTCHARGE (2)
#define CC1_MODE_PULSECHARGE (3)
#define CC1_ITERM_20MA (0 << 2)
#define CC1_ITERM_60MA (2 << 2)
#define CC1_VFCHG_4_2V (9 << 4)
/* bit definitions of Charger Control 2 Register */
#define CC2_ICHG_100MA (0x1)
#define CC2_ICHG_500MA (0x9)
#define CC2_ICHG_1000MA (0x13)
/* bit definitions of Charger Control 3 Register */
#define CC3_180MIN_TIMEOUT (0x6 << 4)
#define CC3_270MIN_TIMEOUT (0x7 << 4)
#define CC3_360MIN_TIMEOUT (0xA << 4)
#define CC3_DISABLE_TIMEOUT (0xF << 4)
/* bit definitions of Charger Control 4 Register */
#define CC4_IPRE_40MA (7)
#define CC4_VPCHG_3_2V (3 << 4)
#define CC4_IFCHG_MON_EN (1 << 6)
#define CC4_BTEMP_MON_EN (1 << 7)
/* bit definitions of Charger Control 6 Register */
#define CC6_BAT_OV_EN (1 << 2)
#define CC6_BAT_UV_EN (1 << 3)
#define CC6_UV_VBAT_SET (0x3 << 6) /* 2.8v */
/* bit definitions of Charger Control 7 Register */
#define CC7_BAT_REM_EN (1 << 3)
#define CC7_IFSM_EN (1 << 7)
/* bit definitions of Measurement Enable 1 Register */
#define MEAS1_VBAT (1 << 0)
/* bit definitions of Measurement Enable 3 Register */
#define MEAS3_IBAT_EN (1 << 0)
#define MEAS3_CC_EN (1 << 2)
#define FSM_INIT 0
#define FSM_DISCHARGE 1
#define FSM_PRECHARGE 2
#define FSM_FASTCHARGE 3
#define PRECHARGE_THRESHOLD 3100
#define POWEROFF_THRESHOLD 3400
#define CHARGE_THRESHOLD 4000
#define DISCHARGE_THRESHOLD 4180
/* over-temperature on PM8606 setting */
#define OVER_TEMP_FLAG (1 << 6)
#define OVTEMP_AUTORECOVER (1 << 3)
/* over-voltage protect on vchg setting mv */
#define VCHG_NORMAL_LOW 4200
#define VCHG_NORMAL_CHECK 5800
#define VCHG_NORMAL_HIGH 6000
#define VCHG_OVP_LOW 5500
struct pm860x_charger_info {
struct pm860x_chip *chip;
struct i2c_client *i2c;
struct i2c_client *i2c_8606;
struct device *dev;
struct power_supply usb;
struct mutex lock;
int irq_nums;
int irq[7];
unsigned state:3; /* fsm state */
unsigned online:1; /* usb charger */
unsigned present:1; /* battery present */
unsigned allowed:1;
};
static char *pm860x_supplied_to[] = {
"battery-monitor",
};
static int measure_vchg(struct pm860x_charger_info *info, int *data)
{
unsigned char buf[2];
int ret = 0;
ret = pm860x_bulk_read(info->i2c, PM8607_VCHG_MEAS1, 2, buf);
if (ret < 0)
return ret;
*data = ((buf[0] & 0xff) << 4) | (buf[1] & 0x0f);
/* V_BATT_MEAS(mV) = value * 5 * 1.8 * 1000 / (2^12) */
*data = ((*data & 0xfff) * 9 * 125) >> 9;
dev_dbg(info->dev, "%s, vchg: %d mv\n", __func__, *data);
return ret;
}
static void set_vchg_threshold(struct pm860x_charger_info *info,
int min, int max)
{
int data;
/* (tmp << 8) * / 5 / 1800 */
if (min <= 0)
data = 0;
else
data = (min << 5) / 1125;
pm860x_reg_write(info->i2c, PM8607_VCHG_LOWTH, data);
dev_dbg(info->dev, "VCHG_LOWTH:%dmv, 0x%x\n", min, data);
if (max <= 0)
data = 0xff;
else
data = (max << 5) / 1125;
pm860x_reg_write(info->i2c, PM8607_VCHG_HIGHTH, data);
dev_dbg(info->dev, "VCHG_HIGHTH:%dmv, 0x%x\n", max, data);
}
static void set_vbatt_threshold(struct pm860x_charger_info *info,
int min, int max)
{
int data;
/* (tmp << 8) * 3 / 1800 */
if (min <= 0)
data = 0;
else
data = (min << 5) / 675;
pm860x_reg_write(info->i2c, PM8607_VBAT_LOWTH, data);
dev_dbg(info->dev, "VBAT Min:%dmv, LOWTH:0x%x\n", min, data);
if (max <= 0)
data = 0xff;
else
data = (max << 5) / 675;
pm860x_reg_write(info->i2c, PM8607_VBAT_HIGHTH, data);
dev_dbg(info->dev, "VBAT Max:%dmv, HIGHTH:0x%x\n", max, data);
return;
}
static int start_precharge(struct pm860x_charger_info *info)
{
int ret;
dev_dbg(info->dev, "Start Pre-charging!\n");
set_vbatt_threshold(info, 0, 0);
ret = pm860x_reg_write(info->i2c_8606, PM8606_PREREGULATORA,
PREREG1_1350MA | PREREG1_VSYS_4_5V);
if (ret < 0)
goto out;
/* stop charging */
ret = pm860x_set_bits(info->i2c, PM8607_CHG_CTRL1, 3,
CC1_MODE_OFF);
if (ret < 0)
goto out;
/* set 270 minutes timeout */
ret = pm860x_set_bits(info->i2c, PM8607_CHG_CTRL3, (0xf << 4),
CC3_270MIN_TIMEOUT);
if (ret < 0)
goto out;
/* set precharge current, termination voltage, IBAT & TBAT monitor */
ret = pm860x_reg_write(info->i2c, PM8607_CHG_CTRL4,
CC4_IPRE_40MA | CC4_VPCHG_3_2V |
CC4_IFCHG_MON_EN | CC4_BTEMP_MON_EN);
if (ret < 0)
goto out;
ret = pm860x_set_bits(info->i2c, PM8607_CHG_CTRL7,
CC7_BAT_REM_EN | CC7_IFSM_EN,
CC7_BAT_REM_EN | CC7_IFSM_EN);
if (ret < 0)
goto out;
/* trigger precharge */
ret = pm860x_set_bits(info->i2c, PM8607_CHG_CTRL1, 3,
CC1_MODE_PRECHARGE);
out:
return ret;
}
static int start_fastcharge(struct pm860x_charger_info *info)
{
int ret;
dev_dbg(info->dev, "Start Fast-charging!\n");
/* set fastcharge termination current & voltage, disable charging */
ret = pm860x_reg_write(info->i2c, PM8607_CHG_CTRL1,
CC1_MODE_OFF | CC1_ITERM_60MA |
CC1_VFCHG_4_2V);
if (ret < 0)
goto out;
ret = pm860x_reg_write(info->i2c_8606, PM8606_PREREGULATORA,
PREREG1_540MA | PREREG1_VSYS_4_5V);
if (ret < 0)
goto out
|