path: root/drivers/power/smb347-charger.c

/*
 * Summit Microelectronics SMB347 Battery Charger Driver
 *
 * Copyright (C) 2011, Intel Corporation
 *
 * Authors: Bruce E. Robertson <bruce.e.robertson@intel.com>
 *          Mika Westerberg <mika.westerberg@linux.intel.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/debugfs.h>
#include <linux/gpio.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/power_supply.h>
#include <linux/power/smb347-charger.h>
#include <linux/seq_file.h>

/*
 * Configuration registers. These are mirrored to volatile RAM and can be
 * written once %CMD_A_ALLOW_WRITE is set in %CMD_A register. They will be
 * reloaded from non-volatile registers after POR.
 */
#define CFG_CHARGE_CURRENT			0x00
#define CFG_CHARGE_CURRENT_FCC_MASK		0xe0
#define CFG_CHARGE_CURRENT_FCC_SHIFT		5
#define CFG_CHARGE_CURRENT_PCC_MASK		0x18
#define CFG_CHARGE_CURRENT_PCC_SHIFT		3
#define CFG_CHARGE_CURRENT_TC_MASK		0x07
#define CFG_CURRENT_LIMIT			0x01
#define CFG_CURRENT_LIMIT_DC_MASK		0xf0
#define CFG_CURRENT_LIMIT_DC_SHIFT		4
#define CFG_CURRENT_LIMIT_USB_MASK		0x0f
#define CFG_FLOAT_VOLTAGE			0x03
#define CFG_FLOAT_VOLTAGE_THRESHOLD_MASK	0xc0
#define CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT	6
#define CFG_STAT				0x05
#define CFG_STAT_DISABLED			BIT(5)
#define CFG_STAT_ACTIVE_HIGH			BIT(7)
#define CFG_PIN					0x06
#define CFG_PIN_EN_CTRL_MASK			0x60
#define CFG_PIN_EN_CTRL_ACTIVE_HIGH		0x40
#define CFG_PIN_EN_CTRL_ACTIVE_LOW		0x60
#define CFG_PIN_EN_APSD_IRQ			BIT(1)
#define CFG_PIN_EN_CHARGER_ERROR		BIT(2)
#define CFG_THERM				0x07
#define CFG_THERM_SOFT_HOT_COMPENSATION_MASK	0x03
#define CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT	0
#define CFG_THERM_SOFT_COLD_COMPENSATION_MASK	0x0c
#define CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT	2
#define CFG_THERM_MONITOR_DISABLED		BIT(4)
#define CFG_SYSOK				0x08
#define CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED	BIT(2)
#define CFG_OTHER				0x09
#define CFG_OTHER_RID_MASK			0xc0
#define CFG_OTHER_RID_ENABLED_AUTO_OTG		0xc0
#define CFG_OTG					0x0a
#define CFG_OTG_TEMP_THRESHOLD_MASK		0x30
#define CFG_OTG_TEMP_THRESHOLD_SHIFT		4
#define CFG_OTG_CC_COMPENSATION_MASK		0xc0
#define CFG_OTG_CC_COMPENSATION_SHIFT		6
#define CFG_TEMP_LIMIT				0x0b
#define CFG_TEMP_LIMIT_SOFT_HOT_MASK		0x03
#define CFG_TEMP_LIMIT_SOFT_HOT_SHIFT		0
#define CFG_TEMP_LIMIT_SOFT_COLD_MASK		0x0c
#define CFG_TEMP_LIMIT_SOFT_COLD_SHIFT		2
#define CFG_TEMP_LIMIT_HARD_HOT_MASK		0x30
#define CFG_TEMP_LIMIT_HARD_HOT_SHIFT		4
#define CFG_TEMP_LIMIT_HARD_COLD_MASK		0xc0
#define CFG_TEMP_LIMIT_HARD_COLD_SHIFT		6
#define CFG_FAULT_IRQ				0x0c
#define CFG_FAULT_IRQ_DCIN_UV			BIT(2)
#define CFG_STATUS_IRQ				0x0d
#define CFG_STATUS_IRQ_TERMINATION_OR_TAPER	BIT(4)
#define CFG_ADDRESS				0x0e

/* Command registers */
#define CMD_A					0x30
#define CMD_A_CHG_ENABLED			BIT(1)
#define CMD_A_SUSPEND_ENABLED			BIT(2)
#define CMD_A_ALLOW_WRITE			BIT(7)
#define CMD_B					0x31
#define CMD_C					0x33

/* Interrupt Status registers */
#define IRQSTAT_A				0x35
#define IRQSTAT_C				0x37
#define IRQSTAT_C_TERMINATION_STAT		BIT(0)
#define IRQSTAT_C_TERMINATION_IRQ		BIT(1)
#define IRQSTAT_C_TAPER_IRQ			BIT(3)
#define IRQSTAT_E				0x39
#define IRQSTAT_E_USBIN_UV_STAT			BIT(0)
#define IRQSTAT_E_USBIN_UV_IRQ			BIT(1)
#define IRQSTAT_E_DCIN_UV_STAT			BIT(4)
#define IRQSTAT_E_DCIN_UV_IRQ			BIT(5)
#define IRQSTAT_F				0x3a

/* Status registers */
#define STAT_A					0x3b
#define STAT_A_FLOAT_VOLTAGE_MASK		0x3f
#define STAT_B					0x3c
#define STAT_C					0x3d
#define STAT_C_CHG_ENABLED			BIT(0)
#define STAT_C_CHG_MASK				0x06
#define STAT_C_CHG_SHIFT			1
#define STAT_C_CHARGER_ERROR			BIT(6)
#define STAT_E					0x3f

/**
 * struct smb347_charger - smb347 charger instance
 * @lock: protects concurrent access to online variables
 * @client: pointer to i2c client
 * @mains: power_supply instance for AC/DC power
 * @usb: power_supply instance for USB power
 * @battery: power_supply instance for battery
 * @mains_online: is AC/DC input connected
 * @usb_online: is USB input connected
 * @charging_enabled: is charging enabled
 * @dentry: for debugfs
 * @pdata: pointer to platform data
 */
struct smb347_charger {
	struct mutex		lock;
	struct i2c_client	*client;
	struct power_supply	mains;
	struct power_supply	usb;
	struct power_supply	battery;
	bool			mains_online;
	bool			usb_online;
	bool			charging_enabled;
	struct dentry		*dentry;
	const struct smb347_charger_platform_data *pdata;
};

/* Fast charge current in uA */
static const unsigned int fcc_tbl[] = {
	700000,
	900000,
	1200000,
	1500000,
	1800000,
	2000000,
	2200000,
	2500000,
};

/* Pre-charge current in uA */
static const unsigned int pcc_tbl[] = {
	100000,
	150000,
	200000,
	250000,
};

/* Termination current in uA */
static const unsigned int tc_tbl[] = {
	37500,