![Ramakrishna Pallala](/assets/img/avatar_default.png)
This patch checks for charger status register for determining the battery charging status and reports Discharing/Charging/Not Charging/Full accordingly. This patch also adds the interrupt support for Safety Timer Expiration. This interrupt is helpful in debugging the cause for charger fault. Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@intel.com> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
1327 lines
32 KiB
C
1327 lines
32 KiB
C
/*
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* Summit Microelectronics SMB347 Battery Charger Driver
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*
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* Copyright (C) 2011, Intel Corporation
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*
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* Authors: Bruce E. Robertson <bruce.e.robertson@intel.com>
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* Mika Westerberg <mika.westerberg@linux.intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/mutex.h>
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#include <linux/power_supply.h>
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#include <linux/power/smb347-charger.h>
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#include <linux/regmap.h>
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/*
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* Configuration registers. These are mirrored to volatile RAM and can be
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* written once %CMD_A_ALLOW_WRITE is set in %CMD_A register. They will be
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* reloaded from non-volatile registers after POR.
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*/
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#define CFG_CHARGE_CURRENT 0x00
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#define CFG_CHARGE_CURRENT_FCC_MASK 0xe0
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#define CFG_CHARGE_CURRENT_FCC_SHIFT 5
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#define CFG_CHARGE_CURRENT_PCC_MASK 0x18
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#define CFG_CHARGE_CURRENT_PCC_SHIFT 3
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#define CFG_CHARGE_CURRENT_TC_MASK 0x07
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#define CFG_CURRENT_LIMIT 0x01
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#define CFG_CURRENT_LIMIT_DC_MASK 0xf0
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#define CFG_CURRENT_LIMIT_DC_SHIFT 4
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#define CFG_CURRENT_LIMIT_USB_MASK 0x0f
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#define CFG_FLOAT_VOLTAGE 0x03
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#define CFG_FLOAT_VOLTAGE_FLOAT_MASK 0x3f
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#define CFG_FLOAT_VOLTAGE_THRESHOLD_MASK 0xc0
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#define CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT 6
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#define CFG_STAT 0x05
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#define CFG_STAT_DISABLED BIT(5)
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#define CFG_STAT_ACTIVE_HIGH BIT(7)
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#define CFG_PIN 0x06
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#define CFG_PIN_EN_CTRL_MASK 0x60
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#define CFG_PIN_EN_CTRL_ACTIVE_HIGH 0x40
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#define CFG_PIN_EN_CTRL_ACTIVE_LOW 0x60
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#define CFG_PIN_EN_APSD_IRQ BIT(1)
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#define CFG_PIN_EN_CHARGER_ERROR BIT(2)
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#define CFG_THERM 0x07
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#define CFG_THERM_SOFT_HOT_COMPENSATION_MASK 0x03
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#define CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT 0
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#define CFG_THERM_SOFT_COLD_COMPENSATION_MASK 0x0c
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#define CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT 2
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#define CFG_THERM_MONITOR_DISABLED BIT(4)
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#define CFG_SYSOK 0x08
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#define CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED BIT(2)
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#define CFG_OTHER 0x09
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#define CFG_OTHER_RID_MASK 0xc0
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#define CFG_OTHER_RID_ENABLED_AUTO_OTG 0xc0
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#define CFG_OTG 0x0a
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#define CFG_OTG_TEMP_THRESHOLD_MASK 0x30
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#define CFG_OTG_TEMP_THRESHOLD_SHIFT 4
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#define CFG_OTG_CC_COMPENSATION_MASK 0xc0
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#define CFG_OTG_CC_COMPENSATION_SHIFT 6
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#define CFG_TEMP_LIMIT 0x0b
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#define CFG_TEMP_LIMIT_SOFT_HOT_MASK 0x03
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#define CFG_TEMP_LIMIT_SOFT_HOT_SHIFT 0
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#define CFG_TEMP_LIMIT_SOFT_COLD_MASK 0x0c
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#define CFG_TEMP_LIMIT_SOFT_COLD_SHIFT 2
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#define CFG_TEMP_LIMIT_HARD_HOT_MASK 0x30
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#define CFG_TEMP_LIMIT_HARD_HOT_SHIFT 4
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#define CFG_TEMP_LIMIT_HARD_COLD_MASK 0xc0
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#define CFG_TEMP_LIMIT_HARD_COLD_SHIFT 6
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#define CFG_FAULT_IRQ 0x0c
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#define CFG_FAULT_IRQ_DCIN_UV BIT(2)
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#define CFG_STATUS_IRQ 0x0d
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#define CFG_STATUS_IRQ_TERMINATION_OR_TAPER BIT(4)
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#define CFG_STATUS_IRQ_CHARGE_TIMEOUT BIT(7)
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#define CFG_ADDRESS 0x0e
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/* Command registers */
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#define CMD_A 0x30
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#define CMD_A_CHG_ENABLED BIT(1)
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#define CMD_A_SUSPEND_ENABLED BIT(2)
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#define CMD_A_ALLOW_WRITE BIT(7)
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#define CMD_B 0x31
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#define CMD_C 0x33
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/* Interrupt Status registers */
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#define IRQSTAT_A 0x35
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#define IRQSTAT_C 0x37
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#define IRQSTAT_C_TERMINATION_STAT BIT(0)
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#define IRQSTAT_C_TERMINATION_IRQ BIT(1)
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#define IRQSTAT_C_TAPER_IRQ BIT(3)
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#define IRQSTAT_D 0x38
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#define IRQSTAT_D_CHARGE_TIMEOUT_STAT BIT(2)
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#define IRQSTAT_D_CHARGE_TIMEOUT_IRQ BIT(3)
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#define IRQSTAT_E 0x39
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#define IRQSTAT_E_USBIN_UV_STAT BIT(0)
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#define IRQSTAT_E_USBIN_UV_IRQ BIT(1)
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#define IRQSTAT_E_DCIN_UV_STAT BIT(4)
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#define IRQSTAT_E_DCIN_UV_IRQ BIT(5)
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#define IRQSTAT_F 0x3a
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/* Status registers */
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#define STAT_A 0x3b
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#define STAT_A_FLOAT_VOLTAGE_MASK 0x3f
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#define STAT_B 0x3c
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#define STAT_C 0x3d
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#define STAT_C_CHG_ENABLED BIT(0)
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#define STAT_C_HOLDOFF_STAT BIT(3)
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#define STAT_C_CHG_MASK 0x06
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#define STAT_C_CHG_SHIFT 1
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#define STAT_C_CHG_TERM BIT(5)
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#define STAT_C_CHARGER_ERROR BIT(6)
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#define STAT_E 0x3f
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#define SMB347_MAX_REGISTER 0x3f
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/**
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* struct smb347_charger - smb347 charger instance
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* @lock: protects concurrent access to online variables
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* @dev: pointer to device
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* @regmap: pointer to driver regmap
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* @mains: power_supply instance for AC/DC power
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* @usb: power_supply instance for USB power
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* @battery: power_supply instance for battery
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* @mains_online: is AC/DC input connected
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* @usb_online: is USB input connected
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* @charging_enabled: is charging enabled
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* @pdata: pointer to platform data
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*/
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struct smb347_charger {
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struct mutex lock;
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struct device *dev;
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struct regmap *regmap;
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struct power_supply mains;
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struct power_supply usb;
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struct power_supply battery;
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bool mains_online;
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bool usb_online;
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bool charging_enabled;
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const struct smb347_charger_platform_data *pdata;
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};
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/* Fast charge current in uA */
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static const unsigned int fcc_tbl[] = {
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700000,
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900000,
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1200000,
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1500000,
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1800000,
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2000000,
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2200000,
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2500000,
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};
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/* Pre-charge current in uA */
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static const unsigned int pcc_tbl[] = {
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100000,
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150000,
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200000,
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250000,
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};
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/* Termination current in uA */
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static const unsigned int tc_tbl[] = {
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37500,
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50000,
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100000,
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150000,
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200000,
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250000,
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500000,
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600000,
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};
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/* Input current limit in uA */
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static const unsigned int icl_tbl[] = {
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300000,
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500000,
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700000,
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900000,
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1200000,
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1500000,
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1800000,
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2000000,
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2200000,
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2500000,
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};
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/* Charge current compensation in uA */
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static const unsigned int ccc_tbl[] = {
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250000,
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700000,
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900000,
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1200000,
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};
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/* Convert register value to current using lookup table */
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static int hw_to_current(const unsigned int *tbl, size_t size, unsigned int val)
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{
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if (val >= size)
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return -EINVAL;
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return tbl[val];
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}
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/* Convert current to register value using lookup table */
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static int current_to_hw(const unsigned int *tbl, size_t size, unsigned int val)
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{
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size_t i;
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for (i = 0; i < size; i++)
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if (val < tbl[i])
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break;
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return i > 0 ? i - 1 : -EINVAL;
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}
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/**
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* smb347_update_ps_status - refreshes the power source status
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* @smb: pointer to smb347 charger instance
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*
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* Function checks whether any power source is connected to the charger and
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* updates internal state accordingly. If there is a change to previous state
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* function returns %1, otherwise %0 and negative errno in case of errror.
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*/
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static int smb347_update_ps_status(struct smb347_charger *smb)
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{
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bool usb = false;
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bool dc = false;
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unsigned int val;
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int ret;
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ret = regmap_read(smb->regmap, IRQSTAT_E, &val);
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if (ret < 0)
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return ret;
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/*
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* Dc and usb are set depending on whether they are enabled in
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* platform data _and_ whether corresponding undervoltage is set.
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*/
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if (smb->pdata->use_mains)
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dc = !(val & IRQSTAT_E_DCIN_UV_STAT);
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if (smb->pdata->use_usb)
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usb = !(val & IRQSTAT_E_USBIN_UV_STAT);
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mutex_lock(&smb->lock);
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ret = smb->mains_online != dc || smb->usb_online != usb;
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smb->mains_online = dc;
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smb->usb_online = usb;
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mutex_unlock(&smb->lock);
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return ret;
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}
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/*
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* smb347_is_ps_online - returns whether input power source is connected
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* @smb: pointer to smb347 charger instance
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*
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* Returns %true if input power source is connected. Note that this is
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* dependent on what platform has configured for usable power sources. For
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* example if USB is disabled, this will return %false even if the USB cable
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* is connected.
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*/
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static bool smb347_is_ps_online(struct smb347_charger *smb)
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{
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bool ret;
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mutex_lock(&smb->lock);
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ret = smb->usb_online || smb->mains_online;
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mutex_unlock(&smb->lock);
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return ret;
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}
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/**
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* smb347_charging_status - returns status of charging
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* @smb: pointer to smb347 charger instance
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*
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* Function returns charging status. %0 means no charging is in progress,
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* %1 means pre-charging, %2 fast-charging and %3 taper-charging.
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*/
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static int smb347_charging_status(struct smb347_charger *smb)
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{
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unsigned int val;
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int ret;
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if (!smb347_is_ps_online(smb))
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return 0;
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ret = regmap_read(smb->regmap, STAT_C, &val);
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if (ret < 0)
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return 0;
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return (val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT;
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}
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static int smb347_charging_set(struct smb347_charger *smb, bool enable)
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{
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int ret = 0;
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if (smb->pdata->enable_control != SMB347_CHG_ENABLE_SW) {
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dev_dbg(smb->dev, "charging enable/disable in SW disabled\n");
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return 0;
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}
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mutex_lock(&smb->lock);
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if (smb->charging_enabled != enable) {
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ret = regmap_update_bits(smb->regmap, CMD_A, CMD_A_CHG_ENABLED,
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enable ? CMD_A_CHG_ENABLED : 0);
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if (!ret)
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smb->charging_enabled = enable;
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}
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mutex_unlock(&smb->lock);
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return ret;
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}
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static inline int smb347_charging_enable(struct smb347_charger *smb)
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{
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return smb347_charging_set(smb, true);
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}
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static inline int smb347_charging_disable(struct smb347_charger *smb)
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{
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return smb347_charging_set(smb, false);
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}
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static int smb347_start_stop_charging(struct smb347_charger *smb)
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{
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int ret;
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/*
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* Depending on whether valid power source is connected or not, we
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* disable or enable the charging. We do it manually because it
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* depends on how the platform has configured the valid inputs.
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*/
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if (smb347_is_ps_online(smb)) {
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ret = smb347_charging_enable(smb);
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if (ret < 0)
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dev_err(smb->dev, "failed to enable charging\n");
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} else {
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ret = smb347_charging_disable(smb);
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if (ret < 0)
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dev_err(smb->dev, "failed to disable charging\n");
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}
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return ret;
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}
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static int smb347_set_charge_current(struct smb347_charger *smb)
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{
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int ret;
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if (smb->pdata->max_charge_current) {
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ret = current_to_hw(fcc_tbl, ARRAY_SIZE(fcc_tbl),
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smb->pdata->max_charge_current);
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if (ret < 0)
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return ret;
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ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
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CFG_CHARGE_CURRENT_FCC_MASK,
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ret << CFG_CHARGE_CURRENT_FCC_SHIFT);
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if (ret < 0)
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return ret;
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}
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if (smb->pdata->pre_charge_current) {
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ret = current_to_hw(pcc_tbl, ARRAY_SIZE(pcc_tbl),
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smb->pdata->pre_charge_current);
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if (ret < 0)
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return ret;
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ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
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CFG_CHARGE_CURRENT_PCC_MASK,
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ret << CFG_CHARGE_CURRENT_PCC_SHIFT);
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if (ret < 0)
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return ret;
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}
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if (smb->pdata->termination_current) {
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ret = current_to_hw(tc_tbl, ARRAY_SIZE(tc_tbl),
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smb->pdata->termination_current);
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if (ret < 0)
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return ret;
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ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
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CFG_CHARGE_CURRENT_TC_MASK, ret);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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static int smb347_set_current_limits(struct smb347_charger *smb)
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{
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int ret;
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if (smb->pdata->mains_current_limit) {
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ret = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl),
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smb->pdata->mains_current_limit);
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if (ret < 0)
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return ret;
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ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
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CFG_CURRENT_LIMIT_DC_MASK,
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ret << CFG_CURRENT_LIMIT_DC_SHIFT);
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if (ret < 0)
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return ret;
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}
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if (smb->pdata->usb_hc_current_limit) {
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ret = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl),
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smb->pdata->usb_hc_current_limit);
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if (ret < 0)
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return ret;
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ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
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CFG_CURRENT_LIMIT_USB_MASK, ret);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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static int smb347_set_voltage_limits(struct smb347_charger *smb)
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{
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int ret;
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if (smb->pdata->pre_to_fast_voltage) {
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ret = smb->pdata->pre_to_fast_voltage;
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/* uV */
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ret = clamp_val(ret, 2400000, 3000000) - 2400000;
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ret /= 200000;
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ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
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CFG_FLOAT_VOLTAGE_THRESHOLD_MASK,
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ret << CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT);
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if (ret < 0)
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return ret;
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}
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if (smb->pdata->max_charge_voltage) {
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ret = smb->pdata->max_charge_voltage;
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/* uV */
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ret = clamp_val(ret, 3500000, 4500000) - 3500000;
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ret /= 20000;
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ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
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CFG_FLOAT_VOLTAGE_FLOAT_MASK, ret);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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static int smb347_set_temp_limits(struct smb347_charger *smb)
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{
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bool enable_therm_monitor = false;
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int ret = 0;
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int val;
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if (smb->pdata->chip_temp_threshold) {
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val = smb->pdata->chip_temp_threshold;
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/* degree C */
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val = clamp_val(val, 100, 130) - 100;
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val /= 10;
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ret = regmap_update_bits(smb->regmap, CFG_OTG,
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CFG_OTG_TEMP_THRESHOLD_MASK,
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val << CFG_OTG_TEMP_THRESHOLD_SHIFT);
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if (ret < 0)
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return ret;
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}
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|
|
if (smb->pdata->soft_cold_temp_limit != SMB347_TEMP_USE_DEFAULT) {
|
|
val = smb->pdata->soft_cold_temp_limit;
|
|
|
|
val = clamp_val(val, 0, 15);
|
|
val /= 5;
|
|
/* this goes from higher to lower so invert the value */
|
|
val = ~val & 0x3;
|
|
|
|
ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
|
|
CFG_TEMP_LIMIT_SOFT_COLD_MASK,
|
|
val << CFG_TEMP_LIMIT_SOFT_COLD_SHIFT);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
enable_therm_monitor = true;
|
|
}
|
|
|
|
if (smb->pdata->soft_hot_temp_limit != SMB347_TEMP_USE_DEFAULT) {
|
|
val = smb->pdata->soft_hot_temp_limit;
|
|
|
|
val = clamp_val(val, 40, 55) - 40;
|
|
val /= 5;
|
|
|
|
ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
|
|
CFG_TEMP_LIMIT_SOFT_HOT_MASK,
|
|
val << CFG_TEMP_LIMIT_SOFT_HOT_SHIFT);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
enable_therm_monitor = true;
|
|
}
|
|
|
|
if (smb->pdata->hard_cold_temp_limit != SMB347_TEMP_USE_DEFAULT) {
|
|
val = smb->pdata->hard_cold_temp_limit;
|
|
|
|
val = clamp_val(val, -5, 10) + 5;
|
|
val /= 5;
|
|
/* this goes from higher to lower so invert the value */
|
|
val = ~val & 0x3;
|
|
|
|
ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
|
|
CFG_TEMP_LIMIT_HARD_COLD_MASK,
|
|
val << CFG_TEMP_LIMIT_HARD_COLD_SHIFT);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
enable_therm_monitor = true;
|
|
}
|
|
|
|
if (smb->pdata->hard_hot_temp_limit != SMB347_TEMP_USE_DEFAULT) {
|
|
val = smb->pdata->hard_hot_temp_limit;
|
|
|
|
val = clamp_val(val, 50, 65) - 50;
|
|
val /= 5;
|
|
|
|
ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
|
|
CFG_TEMP_LIMIT_HARD_HOT_MASK,
|
|
val << CFG_TEMP_LIMIT_HARD_HOT_SHIFT);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
enable_therm_monitor = true;
|
|
}
|
|
|
|
/*
|
|
* If any of the temperature limits are set, we also enable the
|
|
* thermistor monitoring.
|
|
*
|
|
* When soft limits are hit, the device will start to compensate
|
|
* current and/or voltage depending on the configuration.
|
|
*
|
|
* When hard limit is hit, the device will suspend charging
|
|
* depending on the configuration.
|
|
*/
|
|
if (enable_therm_monitor) {
|
|
ret = regmap_update_bits(smb->regmap, CFG_THERM,
|
|
CFG_THERM_MONITOR_DISABLED, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (smb->pdata->suspend_on_hard_temp_limit) {
|
|
ret = regmap_update_bits(smb->regmap, CFG_SYSOK,
|
|
CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (smb->pdata->soft_temp_limit_compensation !=
|
|
SMB347_SOFT_TEMP_COMPENSATE_DEFAULT) {
|
|
val = smb->pdata->soft_temp_limit_compensation & 0x3;
|
|
|
|
ret = regmap_update_bits(smb->regmap, CFG_THERM,
|
|
CFG_THERM_SOFT_HOT_COMPENSATION_MASK,
|
|
val << CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = regmap_update_bits(smb->regmap, CFG_THERM,
|
|
CFG_THERM_SOFT_COLD_COMPENSATION_MASK,
|
|
val << CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (smb->pdata->charge_current_compensation) {
|
|
val = current_to_hw(ccc_tbl, ARRAY_SIZE(ccc_tbl),
|
|
smb->pdata->charge_current_compensation);
|
|
if (val < 0)
|
|
return val;
|
|
|
|
ret = regmap_update_bits(smb->regmap, CFG_OTG,
|
|
CFG_OTG_CC_COMPENSATION_MASK,
|
|
(val & 0x3) << CFG_OTG_CC_COMPENSATION_SHIFT);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* smb347_set_writable - enables/disables writing to non-volatile registers
|
|
* @smb: pointer to smb347 charger instance
|
|
*
|
|
* You can enable/disable writing to the non-volatile configuration
|
|
* registers by calling this function.
|
|
*
|
|
* Returns %0 on success and negative errno in case of failure.
|
|
*/
|
|
static int smb347_set_writable(struct smb347_charger *smb, bool writable)
|
|
{
|
|
return regmap_update_bits(smb->regmap, CMD_A, CMD_A_ALLOW_WRITE,
|
|
writable ? CMD_A_ALLOW_WRITE : 0);
|
|
}
|
|
|
|
static int smb347_hw_init(struct smb347_charger *smb)
|
|
{
|
|
unsigned int val;
|
|
int ret;
|
|
|
|
ret = smb347_set_writable(smb, true);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/*
|
|
* Program the platform specific configuration values to the device
|
|
* first.
|
|
*/
|
|
ret = smb347_set_charge_current(smb);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret = smb347_set_current_limits(smb);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret = smb347_set_voltage_limits(smb);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret = smb347_set_temp_limits(smb);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
/* If USB charging is disabled we put the USB in suspend mode */
|
|
if (!smb->pdata->use_usb) {
|
|
ret = regmap_update_bits(smb->regmap, CMD_A,
|
|
CMD_A_SUSPEND_ENABLED,
|
|
CMD_A_SUSPEND_ENABLED);
|
|
if (ret < 0)
|
|
goto fail;
|
|
}
|
|
|
|
/*
|
|
* If configured by platform data, we enable hardware Auto-OTG
|
|
* support for driving VBUS. Otherwise we disable it.
|
|
*/
|
|
ret = regmap_update_bits(smb->regmap, CFG_OTHER, CFG_OTHER_RID_MASK,
|
|
smb->pdata->use_usb_otg ? CFG_OTHER_RID_ENABLED_AUTO_OTG : 0);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
/*
|
|
* Make the charging functionality controllable by a write to the
|
|
* command register unless pin control is specified in the platform
|
|
* data.
|
|
*/
|
|
switch (smb->pdata->enable_control) {
|
|
case SMB347_CHG_ENABLE_PIN_ACTIVE_LOW:
|
|
val = CFG_PIN_EN_CTRL_ACTIVE_LOW;
|
|
break;
|
|
case SMB347_CHG_ENABLE_PIN_ACTIVE_HIGH:
|
|
val = CFG_PIN_EN_CTRL_ACTIVE_HIGH;
|
|
break;
|
|
default:
|
|
val = 0;
|
|
break;
|
|
}
|
|
|
|
ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CTRL_MASK,
|
|
val);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
/* Disable Automatic Power Source Detection (APSD) interrupt. */
|
|
ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_APSD_IRQ, 0);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret = smb347_update_ps_status(smb);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret = smb347_start_stop_charging(smb);
|
|
|
|
fail:
|
|
smb347_set_writable(smb, false);
|
|
return ret;
|
|
}
|
|
|
|
static irqreturn_t smb347_interrupt(int irq, void *data)
|
|
{
|
|
struct smb347_charger *smb = data;
|
|
unsigned int stat_c, irqstat_c, irqstat_d, irqstat_e;
|
|
bool handled = false;
|
|
int ret;
|
|
|
|
ret = regmap_read(smb->regmap, STAT_C, &stat_c);
|
|
if (ret < 0) {
|
|
dev_warn(smb->dev, "reading STAT_C failed\n");
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
ret = regmap_read(smb->regmap, IRQSTAT_C, &irqstat_c);
|
|
if (ret < 0) {
|
|
dev_warn(smb->dev, "reading IRQSTAT_C failed\n");
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
ret = regmap_read(smb->regmap, IRQSTAT_D, &irqstat_d);
|
|
if (ret < 0) {
|
|
dev_warn(smb->dev, "reading IRQSTAT_D failed\n");
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
ret = regmap_read(smb->regmap, IRQSTAT_E, &irqstat_e);
|
|
if (ret < 0) {
|
|
dev_warn(smb->dev, "reading IRQSTAT_E failed\n");
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
/*
|
|
* If we get charger error we report the error back to user.
|
|
* If the error is recovered charging will resume again.
|
|
*/
|
|
if (stat_c & STAT_C_CHARGER_ERROR) {
|
|
dev_err(smb->dev, "charging stopped due to charger error\n");
|
|
power_supply_changed(&smb->battery);
|
|
handled = true;
|
|
}
|
|
|
|
/*
|
|
* If we reached the termination current the battery is charged and
|
|
* we can update the status now. Charging is automatically
|
|
* disabled by the hardware.
|
|
*/
|
|
if (irqstat_c & (IRQSTAT_C_TERMINATION_IRQ | IRQSTAT_C_TAPER_IRQ)) {
|
|
if (irqstat_c & IRQSTAT_C_TERMINATION_STAT)
|
|
power_supply_changed(&smb->battery);
|
|
dev_dbg(smb->dev, "going to HW maintenance mode\n");
|
|
handled = true;
|
|
}
|
|
|
|
/*
|
|
* If we got a charger timeout INT that means the charge
|
|
* full is not detected with in charge timeout value.
|
|
*/
|
|
if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_IRQ) {
|
|
dev_dbg(smb->dev, "total Charge Timeout INT received\n");
|
|
|
|
if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_STAT)
|
|
dev_warn(smb->dev, "charging stopped due to timeout\n");
|
|
power_supply_changed(&smb->battery);
|
|
handled = true;
|
|
}
|
|
|
|
/*
|
|
* If we got an under voltage interrupt it means that AC/USB input
|
|
* was connected or disconnected.
|
|
*/
|
|
if (irqstat_e & (IRQSTAT_E_USBIN_UV_IRQ | IRQSTAT_E_DCIN_UV_IRQ)) {
|
|
if (smb347_update_ps_status(smb) > 0) {
|
|
smb347_start_stop_charging(smb);
|
|
if (smb->pdata->use_mains)
|
|
power_supply_changed(&smb->mains);
|
|
if (smb->pdata->use_usb)
|
|
power_supply_changed(&smb->usb);
|
|
}
|
|
handled = true;
|
|
}
|
|
|
|
return handled ? IRQ_HANDLED : IRQ_NONE;
|
|
}
|
|
|
|
static int smb347_irq_set(struct smb347_charger *smb, bool enable)
|
|
{
|
|
int ret;
|
|
|
|
ret = smb347_set_writable(smb, true);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/*
|
|
* Enable/disable interrupts for:
|
|
* - under voltage
|
|
* - termination current reached
|
|
* - charger timeout
|
|
* - charger error
|
|
*/
|
|
ret = regmap_update_bits(smb->regmap, CFG_FAULT_IRQ, 0xff,
|
|
enable ? CFG_FAULT_IRQ_DCIN_UV : 0);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret = regmap_update_bits(smb->regmap, CFG_STATUS_IRQ, 0xff,
|
|
enable ? (CFG_STATUS_IRQ_TERMINATION_OR_TAPER |
|
|
CFG_STATUS_IRQ_CHARGE_TIMEOUT) : 0);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CHARGER_ERROR,
|
|
enable ? CFG_PIN_EN_CHARGER_ERROR : 0);
|
|
fail:
|
|
smb347_set_writable(smb, false);
|
|
return ret;
|
|
}
|
|
|
|
static inline int smb347_irq_enable(struct smb347_charger *smb)
|
|
{
|
|
return smb347_irq_set(smb, true);
|
|
}
|
|
|
|
static inline int smb347_irq_disable(struct smb347_charger *smb)
|
|
{
|
|
return smb347_irq_set(smb, false);
|
|
}
|
|
|
|
static int smb347_irq_init(struct smb347_charger *smb,
|
|
struct i2c_client *client)
|
|
{
|
|
const struct smb347_charger_platform_data *pdata = smb->pdata;
|
|
int ret, irq = gpio_to_irq(pdata->irq_gpio);
|
|
|
|
ret = gpio_request_one(pdata->irq_gpio, GPIOF_IN, client->name);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret = request_threaded_irq(irq, NULL, smb347_interrupt,
|
|
IRQF_TRIGGER_FALLING, client->name, smb);
|
|
if (ret < 0)
|
|
goto fail_gpio;
|
|
|
|
ret = smb347_set_writable(smb, true);
|
|
if (ret < 0)
|
|
goto fail_irq;
|
|
|
|
/*
|
|
* Configure the STAT output to be suitable for interrupts: disable
|
|
* all other output (except interrupts) and make it active low.
|
|
*/
|
|
ret = regmap_update_bits(smb->regmap, CFG_STAT,
|
|
CFG_STAT_ACTIVE_HIGH | CFG_STAT_DISABLED,
|
|
CFG_STAT_DISABLED);
|
|
if (ret < 0)
|
|
goto fail_readonly;
|
|
|
|
smb347_set_writable(smb, false);
|
|
client->irq = irq;
|
|
return 0;
|
|
|
|
fail_readonly:
|
|
smb347_set_writable(smb, false);
|
|
fail_irq:
|
|
free_irq(irq, smb);
|
|
fail_gpio:
|
|
gpio_free(pdata->irq_gpio);
|
|
fail:
|
|
client->irq = 0;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Returns the constant charge current programmed
|
|
* into the charger in uA.
|
|
*/
|
|
static int get_const_charge_current(struct smb347_charger *smb)
|
|
{
|
|
int ret, intval;
|
|
unsigned int v;
|
|
|
|
if (!smb347_is_ps_online(smb))
|
|
return -ENODATA;
|
|
|
|
ret = regmap_read(smb->regmap, STAT_B, &v);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/*
|
|
* The current value is composition of FCC and PCC values
|
|
* and we can detect which table to use from bit 5.
|
|
*/
|
|
if (v & 0x20) {
|
|
intval = hw_to_current(fcc_tbl, ARRAY_SIZE(fcc_tbl), v & 7);
|
|
} else {
|
|
v >>= 3;
|
|
intval = hw_to_current(pcc_tbl, ARRAY_SIZE(pcc_tbl), v & 7);
|
|
}
|
|
|
|
return intval;
|
|
}
|
|
|
|
/*
|
|
* Returns the constant charge voltage programmed
|
|
* into the charger in uV.
|
|
*/
|
|
static int get_const_charge_voltage(struct smb347_charger *smb)
|
|
{
|
|
int ret, intval;
|
|
unsigned int v;
|
|
|
|
if (!smb347_is_ps_online(smb))
|
|
return -ENODATA;
|
|
|
|
ret = regmap_read(smb->regmap, STAT_A, &v);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
v &= STAT_A_FLOAT_VOLTAGE_MASK;
|
|
if (v > 0x3d)
|
|
v = 0x3d;
|
|
|
|
intval = 3500000 + v * 20000;
|
|
|
|
return intval;
|
|
}
|
|
|
|
static int smb347_mains_get_property(struct power_supply *psy,
|
|
enum power_supply_property prop,
|
|
union power_supply_propval *val)
|
|
{
|
|
struct smb347_charger *smb =
|
|
container_of(psy, struct smb347_charger, mains);
|
|
int ret;
|
|
|
|
switch (prop) {
|
|
case POWER_SUPPLY_PROP_ONLINE:
|
|
val->intval = smb->mains_online;
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
|
|
ret = get_const_charge_voltage(smb);
|
|
if (ret < 0)
|
|
return ret;
|
|
else
|
|
val->intval = ret;
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
|
|
ret = get_const_charge_current(smb);
|
|
if (ret < 0)
|
|
return ret;
|
|
else
|
|
val->intval = ret;
|
|
break;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static enum power_supply_property smb347_mains_properties[] = {
|
|
POWER_SUPPLY_PROP_ONLINE,
|
|
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
|
|
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
|
|
};
|
|
|
|
static int smb347_usb_get_property(struct power_supply *psy,
|
|
enum power_supply_property prop,
|
|
union power_supply_propval *val)
|
|
{
|
|
struct smb347_charger *smb =
|
|
container_of(psy, struct smb347_charger, usb);
|
|
int ret;
|
|
|
|
switch (prop) {
|
|
case POWER_SUPPLY_PROP_ONLINE:
|
|
val->intval = smb->usb_online;
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
|
|
ret = get_const_charge_voltage(smb);
|
|
if (ret < 0)
|
|
return ret;
|
|
else
|
|
val->intval = ret;
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
|
|
ret = get_const_charge_current(smb);
|
|
if (ret < 0)
|
|
return ret;
|
|
else
|
|
val->intval = ret;
|
|
break;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static enum power_supply_property smb347_usb_properties[] = {
|
|
POWER_SUPPLY_PROP_ONLINE,
|
|
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
|
|
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
|
|
};
|
|
|
|
static int smb347_get_charging_status(struct smb347_charger *smb)
|
|
{
|
|
int ret, status;
|
|
unsigned int val;
|
|
|
|
if (!smb347_is_ps_online(smb))
|
|
return POWER_SUPPLY_STATUS_DISCHARGING;
|
|
|
|
ret = regmap_read(smb->regmap, STAT_C, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if ((val & STAT_C_CHARGER_ERROR) ||
|
|
(val & STAT_C_HOLDOFF_STAT)) {
|
|
/*
|
|
* set to NOT CHARGING upon charger error
|
|
* or charging has stopped.
|
|
*/
|
|
status = POWER_SUPPLY_STATUS_NOT_CHARGING;
|
|
} else {
|
|
if ((val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT) {
|
|
/*
|
|
* set to charging if battery is in pre-charge,
|
|
* fast charge or taper charging mode.
|
|
*/
|
|
status = POWER_SUPPLY_STATUS_CHARGING;
|
|
} else if (val & STAT_C_CHG_TERM) {
|
|
/*
|
|
* set the status to FULL if battery is not in pre
|
|
* charge, fast charge or taper charging mode AND
|
|
* charging is terminated at least once.
|
|
*/
|
|
status = POWER_SUPPLY_STATUS_FULL;
|
|
} else {
|
|
/*
|
|
* in this case no charger error or termination
|
|
* occured but charging is not in progress!!!
|
|
*/
|
|
status = POWER_SUPPLY_STATUS_NOT_CHARGING;
|
|
}
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
static int smb347_battery_get_property(struct power_supply *psy,
|
|
enum power_supply_property prop,
|
|
union power_supply_propval *val)
|
|
{
|
|
struct smb347_charger *smb =
|
|
container_of(psy, struct smb347_charger, battery);
|
|
const struct smb347_charger_platform_data *pdata = smb->pdata;
|
|
int ret;
|
|
|
|
ret = smb347_update_ps_status(smb);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
switch (prop) {
|
|
case POWER_SUPPLY_PROP_STATUS:
|
|
ret = smb347_get_charging_status(smb);
|
|
if (ret < 0)
|
|
return ret;
|
|
val->intval = ret;
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_CHARGE_TYPE:
|
|
if (!smb347_is_ps_online(smb))
|
|
return -ENODATA;
|
|
|
|
/*
|
|
* We handle trickle and pre-charging the same, and taper
|
|
* and none the same.
|
|
*/
|
|
switch (smb347_charging_status(smb)) {
|
|
case 1:
|
|
val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
|
|
break;
|
|
case 2:
|
|
val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
|
|
break;
|
|
default:
|
|
val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_TECHNOLOGY:
|
|
val->intval = pdata->battery_info.technology;
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
|
|
val->intval = pdata->battery_info.voltage_min_design;
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
|
|
val->intval = pdata->battery_info.voltage_max_design;
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
|
|
val->intval = pdata->battery_info.charge_full_design;
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_MODEL_NAME:
|
|
val->strval = pdata->battery_info.name;
|
|
break;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static enum power_supply_property smb347_battery_properties[] = {
|
|
POWER_SUPPLY_PROP_STATUS,
|
|
POWER_SUPPLY_PROP_CHARGE_TYPE,
|
|
POWER_SUPPLY_PROP_TECHNOLOGY,
|
|
POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
|
|
POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
|
|
POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
|
|
POWER_SUPPLY_PROP_MODEL_NAME,
|
|
};
|
|
|
|
static bool smb347_volatile_reg(struct device *dev, unsigned int reg)
|
|
{
|
|
switch (reg) {
|
|
case IRQSTAT_A:
|
|
case IRQSTAT_C:
|
|
case IRQSTAT_E:
|
|
case IRQSTAT_F:
|
|
case STAT_A:
|
|
case STAT_B:
|
|
case STAT_C:
|
|
case STAT_E:
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool smb347_readable_reg(struct device *dev, unsigned int reg)
|
|
{
|
|
switch (reg) {
|
|
case CFG_CHARGE_CURRENT:
|
|
case CFG_CURRENT_LIMIT:
|
|
case CFG_FLOAT_VOLTAGE:
|
|
case CFG_STAT:
|
|
case CFG_PIN:
|
|
case CFG_THERM:
|
|
case CFG_SYSOK:
|
|
case CFG_OTHER:
|
|
case CFG_OTG:
|
|
case CFG_TEMP_LIMIT:
|
|
case CFG_FAULT_IRQ:
|
|
case CFG_STATUS_IRQ:
|
|
case CFG_ADDRESS:
|
|
case CMD_A:
|
|
case CMD_B:
|
|
case CMD_C:
|
|
return true;
|
|
}
|
|
|
|
return smb347_volatile_reg(dev, reg);
|
|
}
|
|
|
|
static const struct regmap_config smb347_regmap = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
.max_register = SMB347_MAX_REGISTER,
|
|
.volatile_reg = smb347_volatile_reg,
|
|
.readable_reg = smb347_readable_reg,
|
|
};
|
|
|
|
static int smb347_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
static char *battery[] = { "smb347-battery" };
|
|
const struct smb347_charger_platform_data *pdata;
|
|
struct device *dev = &client->dev;
|
|
struct smb347_charger *smb;
|
|
int ret;
|
|
|
|
pdata = dev->platform_data;
|
|
if (!pdata)
|
|
return -EINVAL;
|
|
|
|
if (!pdata->use_mains && !pdata->use_usb)
|
|
return -EINVAL;
|
|
|
|
smb = devm_kzalloc(dev, sizeof(*smb), GFP_KERNEL);
|
|
if (!smb)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(client, smb);
|
|
|
|
mutex_init(&smb->lock);
|
|
smb->dev = &client->dev;
|
|
smb->pdata = pdata;
|
|
|
|
smb->regmap = devm_regmap_init_i2c(client, &smb347_regmap);
|
|
if (IS_ERR(smb->regmap))
|
|
return PTR_ERR(smb->regmap);
|
|
|
|
ret = smb347_hw_init(smb);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (smb->pdata->use_mains) {
|
|
smb->mains.name = "smb347-mains";
|
|
smb->mains.type = POWER_SUPPLY_TYPE_MAINS;
|
|
smb->mains.get_property = smb347_mains_get_property;
|
|
smb->mains.properties = smb347_mains_properties;
|
|
smb->mains.num_properties = ARRAY_SIZE(smb347_mains_properties);
|
|
smb->mains.supplied_to = battery;
|
|
smb->mains.num_supplicants = ARRAY_SIZE(battery);
|
|
ret = power_supply_register(dev, &smb->mains);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (smb->pdata->use_usb) {
|
|
smb->usb.name = "smb347-usb";
|
|
smb->usb.type = POWER_SUPPLY_TYPE_USB;
|
|
smb->usb.get_property = smb347_usb_get_property;
|
|
smb->usb.properties = smb347_usb_properties;
|
|
smb->usb.num_properties = ARRAY_SIZE(smb347_usb_properties);
|
|
smb->usb.supplied_to = battery;
|
|
smb->usb.num_supplicants = ARRAY_SIZE(battery);
|
|
ret = power_supply_register(dev, &smb->usb);
|
|
if (ret < 0) {
|
|
if (smb->pdata->use_mains)
|
|
power_supply_unregister(&smb->mains);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
smb->battery.name = "smb347-battery";
|
|
smb->battery.type = POWER_SUPPLY_TYPE_BATTERY;
|
|
smb->battery.get_property = smb347_battery_get_property;
|
|
smb->battery.properties = smb347_battery_properties;
|
|
smb->battery.num_properties = ARRAY_SIZE(smb347_battery_properties);
|
|
|
|
|
|
ret = power_supply_register(dev, &smb->battery);
|
|
if (ret < 0) {
|
|
if (smb->pdata->use_usb)
|
|
power_supply_unregister(&smb->usb);
|
|
if (smb->pdata->use_mains)
|
|
power_supply_unregister(&smb->mains);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Interrupt pin is optional. If it is connected, we setup the
|
|
* interrupt support here.
|
|
*/
|
|
if (pdata->irq_gpio >= 0) {
|
|
ret = smb347_irq_init(smb, client);
|
|
if (ret < 0) {
|
|
dev_warn(dev, "failed to initialize IRQ: %d\n", ret);
|
|
dev_warn(dev, "disabling IRQ support\n");
|
|
} else {
|
|
smb347_irq_enable(smb);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int smb347_remove(struct i2c_client *client)
|
|
{
|
|
struct smb347_charger *smb = i2c_get_clientdata(client);
|
|
|
|
if (client->irq) {
|
|
smb347_irq_disable(smb);
|
|
free_irq(client->irq, smb);
|
|
gpio_free(smb->pdata->irq_gpio);
|
|
}
|
|
|
|
power_supply_unregister(&smb->battery);
|
|
if (smb->pdata->use_usb)
|
|
power_supply_unregister(&smb->usb);
|
|
if (smb->pdata->use_mains)
|
|
power_supply_unregister(&smb->mains);
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id smb347_id[] = {
|
|
{ "smb347", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, smb347_id);
|
|
|
|
static struct i2c_driver smb347_driver = {
|
|
.driver = {
|
|
.name = "smb347",
|
|
},
|
|
.probe = smb347_probe,
|
|
.remove = __devexit_p(smb347_remove),
|
|
.id_table = smb347_id,
|
|
};
|
|
|
|
module_i2c_driver(smb347_driver);
|
|
|
|
MODULE_AUTHOR("Bruce E. Robertson <bruce.e.robertson@intel.com>");
|
|
MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
|
|
MODULE_DESCRIPTION("SMB347 battery charger driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("i2c:smb347");
|