![Bruce E. Robertson](/assets/img/avatar_default.png)
Driver support for the Summit I²C battery charger. This is used in some Intel devices. Signed-off-by: Bruce E. Robertson <bruce.e.robertson@intel.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
1295 lines
30 KiB
C
1295 lines
30 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/debugfs.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/seq_file.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_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_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_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_CHG_MASK 0x06
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#define STAT_C_CHG_SHIFT 1
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#define STAT_C_CHARGER_ERROR BIT(6)
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#define STAT_E 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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* @client: pointer to i2c client
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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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* @dentry: for debugfs
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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 i2c_client *client;
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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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struct dentry *dentry;
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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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static int smb347_read(struct smb347_charger *smb, u8 reg)
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{
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int ret;
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ret = i2c_smbus_read_byte_data(smb->client, reg);
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if (ret < 0)
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dev_warn(&smb->client->dev, "failed to read reg 0x%x: %d\n",
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reg, ret);
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return ret;
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}
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static int smb347_write(struct smb347_charger *smb, u8 reg, u8 val)
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{
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int ret;
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ret = i2c_smbus_write_byte_data(smb->client, reg, val);
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if (ret < 0)
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dev_warn(&smb->client->dev, "failed to write reg 0x%x: %d\n",
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reg, ret);
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return ret;
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}
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/**
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* smb347_update_status - updates the charging status
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* @smb: pointer to smb347 charger instance
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*
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* Function checks status of the charging and updates internal state
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* accordingly. Returns %0 if there is no change in status, %1 if the
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* status has changed and negative errno in case of failure.
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*/
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static int smb347_update_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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int ret;
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ret = smb347_read(smb, IRQSTAT_E);
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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 = !(ret & IRQSTAT_E_DCIN_UV_STAT);
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if (smb->pdata->use_usb)
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usb = !(ret & 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_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
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* cable is connected.
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*/
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static bool smb347_is_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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int ret;
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if (!smb347_is_online(smb))
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return 0;
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ret = smb347_read(smb, STAT_C);
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if (ret < 0)
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return 0;
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return (ret & 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->client->dev,
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"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 = smb347_read(smb, CMD_A);
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if (ret < 0)
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goto out;
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smb->charging_enabled = enable;
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if (enable)
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ret |= CMD_A_CHG_ENABLED;
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else
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ret &= ~CMD_A_CHG_ENABLED;
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ret = smb347_write(smb, CMD_A, ret);
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}
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out:
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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_update_online(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_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->client->dev,
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"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->client->dev,
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"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, val;
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ret = smb347_read(smb, CFG_CHARGE_CURRENT);
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if (ret < 0)
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return ret;
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if (smb->pdata->max_charge_current) {
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val = current_to_hw(fcc_tbl, ARRAY_SIZE(fcc_tbl),
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smb->pdata->max_charge_current);
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if (val < 0)
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return val;
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ret &= ~CFG_CHARGE_CURRENT_FCC_MASK;
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ret |= val << CFG_CHARGE_CURRENT_FCC_SHIFT;
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}
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if (smb->pdata->pre_charge_current) {
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val = current_to_hw(pcc_tbl, ARRAY_SIZE(pcc_tbl),
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smb->pdata->pre_charge_current);
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if (val < 0)
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return val;
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ret &= ~CFG_CHARGE_CURRENT_PCC_MASK;
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ret |= val << CFG_CHARGE_CURRENT_PCC_SHIFT;
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}
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if (smb->pdata->termination_current) {
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val = current_to_hw(tc_tbl, ARRAY_SIZE(tc_tbl),
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smb->pdata->termination_current);
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if (val < 0)
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return val;
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ret &= ~CFG_CHARGE_CURRENT_TC_MASK;
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ret |= val;
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}
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return smb347_write(smb, CFG_CHARGE_CURRENT, ret);
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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, val;
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ret = smb347_read(smb, CFG_CURRENT_LIMIT);
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if (ret < 0)
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return ret;
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if (smb->pdata->mains_current_limit) {
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val = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl),
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smb->pdata->mains_current_limit);
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if (val < 0)
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return val;
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ret &= ~CFG_CURRENT_LIMIT_DC_MASK;
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ret |= val << CFG_CURRENT_LIMIT_DC_SHIFT;
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}
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if (smb->pdata->usb_hc_current_limit) {
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val = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl),
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smb->pdata->usb_hc_current_limit);
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if (val < 0)
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return val;
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ret &= ~CFG_CURRENT_LIMIT_USB_MASK;
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ret |= val;
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}
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return smb347_write(smb, CFG_CURRENT_LIMIT, ret);
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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, val;
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ret = smb347_read(smb, CFG_FLOAT_VOLTAGE);
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if (ret < 0)
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return ret;
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if (smb->pdata->pre_to_fast_voltage) {
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val = smb->pdata->pre_to_fast_voltage;
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/* uV */
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val = clamp_val(val, 2400000, 3000000) - 2400000;
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val /= 200000;
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ret &= ~CFG_FLOAT_VOLTAGE_THRESHOLD_MASK;
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ret |= val << CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT;
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}
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if (smb->pdata->max_charge_voltage) {
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val = smb->pdata->max_charge_voltage;
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/* uV */
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val = clamp_val(val, 3500000, 4500000) - 3500000;
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val /= 20000;
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ret |= val;
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}
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return smb347_write(smb, CFG_FLOAT_VOLTAGE, ret);
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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, 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 = smb347_read(smb, CFG_OTG);
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if (ret < 0)
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return ret;
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ret &= ~CFG_OTG_TEMP_THRESHOLD_MASK;
|
|
ret |= val << CFG_OTG_TEMP_THRESHOLD_SHIFT;
|
|
|
|
ret = smb347_write(smb, CFG_OTG, ret);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
ret = smb347_read(smb, CFG_TEMP_LIMIT);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
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 &= ~CFG_TEMP_LIMIT_SOFT_COLD_MASK;
|
|
ret |= val << CFG_TEMP_LIMIT_SOFT_COLD_SHIFT;
|
|
|
|
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 &= ~CFG_TEMP_LIMIT_SOFT_HOT_MASK;
|
|
ret |= val << CFG_TEMP_LIMIT_SOFT_HOT_SHIFT;
|
|
|
|
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 &= ~CFG_TEMP_LIMIT_HARD_COLD_MASK;
|
|
ret |= val << CFG_TEMP_LIMIT_HARD_COLD_SHIFT;
|
|
|
|
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 &= ~CFG_TEMP_LIMIT_HARD_HOT_MASK;
|
|
ret |= val << CFG_TEMP_LIMIT_HARD_HOT_SHIFT;
|
|
|
|
enable_therm_monitor = true;
|
|
}
|
|
|
|
ret = smb347_write(smb, CFG_TEMP_LIMIT, ret);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/*
|
|
* 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 = smb347_read(smb, CFG_THERM);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret &= ~CFG_THERM_MONITOR_DISABLED;
|
|
|
|
ret = smb347_write(smb, CFG_THERM, ret);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (smb->pdata->suspend_on_hard_temp_limit) {
|
|
ret = smb347_read(smb, CFG_SYSOK);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret &= ~CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED;
|
|
|
|
ret = smb347_write(smb, CFG_SYSOK, ret);
|
|
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 = smb347_read(smb, CFG_THERM);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret &= ~CFG_THERM_SOFT_HOT_COMPENSATION_MASK;
|
|
ret |= val << CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT;
|
|
|
|
ret &= ~CFG_THERM_SOFT_COLD_COMPENSATION_MASK;
|
|
ret |= val << CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT;
|
|
|
|
ret = smb347_write(smb, CFG_THERM, ret);
|
|
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 = smb347_read(smb, CFG_OTG);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret &= ~CFG_OTG_CC_COMPENSATION_MASK;
|
|
ret |= (val & 0x3) << CFG_OTG_CC_COMPENSATION_SHIFT;
|
|
|
|
ret = smb347_write(smb, CFG_OTG, ret);
|
|
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)
|
|
{
|
|
int ret;
|
|
|
|
ret = smb347_read(smb, CMD_A);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (writable)
|
|
ret |= CMD_A_ALLOW_WRITE;
|
|
else
|
|
ret &= ~CMD_A_ALLOW_WRITE;
|
|
|
|
return smb347_write(smb, CMD_A, ret);
|
|
}
|
|
|
|
static int smb347_hw_init(struct smb347_charger *smb)
|
|
{
|
|
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 = smb347_read(smb, CMD_A);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret |= CMD_A_SUSPEND_ENABLED;
|
|
|
|
ret = smb347_write(smb, CMD_A, ret);
|
|
if (ret < 0)
|
|
goto fail;
|
|
}
|
|
|
|
ret = smb347_read(smb, CFG_OTHER);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
/*
|
|
* If configured by platform data, we enable hardware Auto-OTG
|
|
* support for driving VBUS. Otherwise we disable it.
|
|
*/
|
|
ret &= ~CFG_OTHER_RID_MASK;
|
|
if (smb->pdata->use_usb_otg)
|
|
ret |= CFG_OTHER_RID_ENABLED_AUTO_OTG;
|
|
|
|
ret = smb347_write(smb, CFG_OTHER, ret);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret = smb347_read(smb, CFG_PIN);
|
|
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.
|
|
*/
|
|
ret &= ~CFG_PIN_EN_CTRL_MASK;
|
|
|
|
switch (smb->pdata->enable_control) {
|
|
case SMB347_CHG_ENABLE_SW:
|
|
/* Do nothing, 0 means i2c control */
|
|
break;
|
|
case SMB347_CHG_ENABLE_PIN_ACTIVE_LOW:
|
|
ret |= CFG_PIN_EN_CTRL_ACTIVE_LOW;
|
|
break;
|
|
case SMB347_CHG_ENABLE_PIN_ACTIVE_HIGH:
|
|
ret |= CFG_PIN_EN_CTRL_ACTIVE_HIGH;
|
|
break;
|
|
}
|
|
|
|
/* Disable Automatic Power Source Detection (APSD) interrupt. */
|
|
ret &= ~CFG_PIN_EN_APSD_IRQ;
|
|
|
|
ret = smb347_write(smb, CFG_PIN, ret);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret = smb347_update_status(smb);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret = smb347_update_online(smb);
|
|
|
|
fail:
|
|
smb347_set_writable(smb, false);
|
|
return ret;
|
|
}
|
|
|
|
static irqreturn_t smb347_interrupt(int irq, void *data)
|
|
{
|
|
struct smb347_charger *smb = data;
|
|
int stat_c, irqstat_e, irqstat_c;
|
|
irqreturn_t ret = IRQ_NONE;
|
|
|
|
stat_c = smb347_read(smb, STAT_C);
|
|
if (stat_c < 0) {
|
|
dev_warn(&smb->client->dev, "reading STAT_C failed\n");
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
irqstat_c = smb347_read(smb, IRQSTAT_C);
|
|
if (irqstat_c < 0) {
|
|
dev_warn(&smb->client->dev, "reading IRQSTAT_C failed\n");
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
irqstat_e = smb347_read(smb, IRQSTAT_E);
|
|
if (irqstat_e < 0) {
|
|
dev_warn(&smb->client->dev, "reading IRQSTAT_E failed\n");
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
/*
|
|
* If we get charger error we report the error back to user and
|
|
* disable charging.
|
|
*/
|
|
if (stat_c & STAT_C_CHARGER_ERROR) {
|
|
dev_err(&smb->client->dev,
|
|
"error in charger, disabling charging\n");
|
|
|
|
smb347_charging_disable(smb);
|
|
power_supply_changed(&smb->battery);
|
|
|
|
ret = IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
ret = IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* 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_status(smb) > 0) {
|
|
smb347_update_online(smb);
|
|
power_supply_changed(&smb->mains);
|
|
power_supply_changed(&smb->usb);
|
|
}
|
|
ret = IRQ_HANDLED;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
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 error
|
|
*/
|
|
if (enable) {
|
|
ret = smb347_write(smb, CFG_FAULT_IRQ, CFG_FAULT_IRQ_DCIN_UV);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret = smb347_write(smb, CFG_STATUS_IRQ,
|
|
CFG_STATUS_IRQ_TERMINATION_OR_TAPER);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret = smb347_read(smb, CFG_PIN);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret |= CFG_PIN_EN_CHARGER_ERROR;
|
|
|
|
ret = smb347_write(smb, CFG_PIN, ret);
|
|
} else {
|
|
ret = smb347_write(smb, CFG_FAULT_IRQ, 0);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret = smb347_write(smb, CFG_STATUS_IRQ, 0);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret = smb347_read(smb, CFG_PIN);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret &= ~CFG_PIN_EN_CHARGER_ERROR;
|
|
|
|
ret = smb347_write(smb, CFG_PIN, ret);
|
|
}
|
|
|
|
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)
|
|
{
|
|
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, smb->client->name);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret = request_threaded_irq(irq, NULL, smb347_interrupt,
|
|
IRQF_TRIGGER_FALLING, smb->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 = smb347_read(smb, CFG_STAT);
|
|
if (ret < 0)
|
|
goto fail_readonly;
|
|
|
|
ret &= ~CFG_STAT_ACTIVE_HIGH;
|
|
ret |= CFG_STAT_DISABLED;
|
|
|
|
ret = smb347_write(smb, CFG_STAT, ret);
|
|
if (ret < 0)
|
|
goto fail_readonly;
|
|
|
|
ret = smb347_irq_enable(smb);
|
|
if (ret < 0)
|
|
goto fail_readonly;
|
|
|
|
smb347_set_writable(smb, false);
|
|
smb->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:
|
|
smb->client->irq = 0;
|
|
return ret;
|
|
}
|
|
|
|
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);
|
|
|
|
if (prop == POWER_SUPPLY_PROP_ONLINE) {
|
|
val->intval = smb->mains_online;
|
|
return 0;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static enum power_supply_property smb347_mains_properties[] = {
|
|
POWER_SUPPLY_PROP_ONLINE,
|
|
};
|
|
|
|
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);
|
|
|
|
if (prop == POWER_SUPPLY_PROP_ONLINE) {
|
|
val->intval = smb->usb_online;
|
|
return 0;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static enum power_supply_property smb347_usb_properties[] = {
|
|
POWER_SUPPLY_PROP_ONLINE,
|
|
};
|
|
|
|
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_status(smb);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
switch (prop) {
|
|
case POWER_SUPPLY_PROP_STATUS:
|
|
if (!smb347_is_online(smb)) {
|
|
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
|
|
break;
|
|
}
|
|
if (smb347_charging_status(smb))
|
|
val->intval = POWER_SUPPLY_STATUS_CHARGING;
|
|
else
|
|
val->intval = POWER_SUPPLY_STATUS_FULL;
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_CHARGE_TYPE:
|
|
if (!smb347_is_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_VOLTAGE_NOW:
|
|
if (!smb347_is_online(smb))
|
|
return -ENODATA;
|
|
ret = smb347_read(smb, STAT_A);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret &= STAT_A_FLOAT_VOLTAGE_MASK;
|
|
if (ret > 0x3d)
|
|
ret = 0x3d;
|
|
|
|
val->intval = 3500000 + ret * 20000;
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_CURRENT_NOW:
|
|
if (!smb347_is_online(smb))
|
|
return -ENODATA;
|
|
|
|
ret = smb347_read(smb, STAT_B);
|
|
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 (ret & 0x20) {
|
|
val->intval = hw_to_current(fcc_tbl,
|
|
ARRAY_SIZE(fcc_tbl),
|
|
ret & 7);
|
|
} else {
|
|
ret >>= 3;
|
|
val->intval = hw_to_current(pcc_tbl,
|
|
ARRAY_SIZE(pcc_tbl),
|
|
ret & 7);
|
|
}
|
|
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_VOLTAGE_NOW,
|
|
POWER_SUPPLY_PROP_CURRENT_NOW,
|
|
POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
|
|
POWER_SUPPLY_PROP_MODEL_NAME,
|
|
};
|
|
|
|
static int smb347_debugfs_show(struct seq_file *s, void *data)
|
|
{
|
|
struct smb347_charger *smb = s->private;
|
|
int ret;
|
|
u8 reg;
|
|
|
|
seq_printf(s, "Control registers:\n");
|
|
seq_printf(s, "==================\n");
|
|
for (reg = CFG_CHARGE_CURRENT; reg <= CFG_ADDRESS; reg++) {
|
|
ret = smb347_read(smb, reg);
|
|
seq_printf(s, "0x%02x:\t0x%02x\n", reg, ret);
|
|
}
|
|
seq_printf(s, "\n");
|
|
|
|
seq_printf(s, "Command registers:\n");
|
|
seq_printf(s, "==================\n");
|
|
ret = smb347_read(smb, CMD_A);
|
|
seq_printf(s, "0x%02x:\t0x%02x\n", CMD_A, ret);
|
|
ret = smb347_read(smb, CMD_B);
|
|
seq_printf(s, "0x%02x:\t0x%02x\n", CMD_B, ret);
|
|
ret = smb347_read(smb, CMD_C);
|
|
seq_printf(s, "0x%02x:\t0x%02x\n", CMD_C, ret);
|
|
seq_printf(s, "\n");
|
|
|
|
seq_printf(s, "Interrupt status registers:\n");
|
|
seq_printf(s, "===========================\n");
|
|
for (reg = IRQSTAT_A; reg <= IRQSTAT_F; reg++) {
|
|
ret = smb347_read(smb, reg);
|
|
seq_printf(s, "0x%02x:\t0x%02x\n", reg, ret);
|
|
}
|
|
seq_printf(s, "\n");
|
|
|
|
seq_printf(s, "Status registers:\n");
|
|
seq_printf(s, "=================\n");
|
|
for (reg = STAT_A; reg <= STAT_E; reg++) {
|
|
ret = smb347_read(smb, reg);
|
|
seq_printf(s, "0x%02x:\t0x%02x\n", reg, ret);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int smb347_debugfs_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, smb347_debugfs_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations smb347_debugfs_fops = {
|
|
.open = smb347_debugfs_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
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->client = client;
|
|
smb->pdata = pdata;
|
|
|
|
ret = smb347_hw_init(smb);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
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);
|
|
|
|
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);
|
|
|
|
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->mains);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = power_supply_register(dev, &smb->usb);
|
|
if (ret < 0) {
|
|
power_supply_unregister(&smb->mains);
|
|
return ret;
|
|
}
|
|
|
|
ret = power_supply_register(dev, &smb->battery);
|
|
if (ret < 0) {
|
|
power_supply_unregister(&smb->usb);
|
|
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);
|
|
if (ret < 0) {
|
|
dev_warn(dev, "failed to initialize IRQ: %d\n", ret);
|
|
dev_warn(dev, "disabling IRQ support\n");
|
|
}
|
|
}
|
|
|
|
smb->dentry = debugfs_create_file("smb347-regs", S_IRUSR, NULL, smb,
|
|
&smb347_debugfs_fops);
|
|
return 0;
|
|
}
|
|
|
|
static int smb347_remove(struct i2c_client *client)
|
|
{
|
|
struct smb347_charger *smb = i2c_get_clientdata(client);
|
|
|
|
if (!IS_ERR_OR_NULL(smb->dentry))
|
|
debugfs_remove(smb->dentry);
|
|
|
|
if (client->irq) {
|
|
smb347_irq_disable(smb);
|
|
free_irq(client->irq, smb);
|
|
gpio_free(smb->pdata->irq_gpio);
|
|
}
|
|
|
|
power_supply_unregister(&smb->battery);
|
|
power_supply_unregister(&smb->usb);
|
|
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,
|
|
};
|
|
|
|
static int __init smb347_init(void)
|
|
{
|
|
return i2c_add_driver(&smb347_driver);
|
|
}
|
|
module_init(smb347_init);
|
|
|
|
static void __exit smb347_exit(void)
|
|
{
|
|
i2c_del_driver(&smb347_driver);
|
|
}
|
|
module_exit(smb347_exit);
|
|
|
|
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");
|