1643 lines
43 KiB
C
1643 lines
43 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#include <linux/delay.h>
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#include <linux/err.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/power_supply.h>
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#include <linux/property.h>
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#include <linux/regmap.h>
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#include <linux/regulator/driver.h>
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#include <dt-bindings/power/summit,smb347-charger.h>
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/* Use the default compensation method */
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#define SMB3XX_SOFT_TEMP_COMPENSATE_DEFAULT -1
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/* Use default factory programmed value for hard/soft temperature limit */
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#define SMB3XX_TEMP_USE_DEFAULT -273
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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_PIN_EN_CTRL BIT(4)
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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_INOK_ACTIVE_HIGH BIT(0)
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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_CURRENT_LIMIT_250mA BIT(2)
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#define CFG_OTG_CURRENT_LIMIT_750mA BIT(3)
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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_OTG_ENABLED BIT(4)
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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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* @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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* @usb_rdev: USB VBUS regulator device
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* @id: SMB charger ID
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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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* @irq_unsupported: is interrupt unsupported by SMB hardware
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* @usb_vbus_enabled: is USB VBUS powered by SMB charger
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* @max_charge_current: maximum current (in uA) the battery can be charged
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* @max_charge_voltage: maximum voltage (in uV) the battery can be charged
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* @pre_charge_current: current (in uA) to use in pre-charging phase
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* @termination_current: current (in uA) used to determine when the
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* charging cycle terminates
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* @pre_to_fast_voltage: voltage (in uV) treshold used for transitioning to
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* pre-charge to fast charge mode
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* @mains_current_limit: maximum input current drawn from AC/DC input (in uA)
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* @usb_hc_current_limit: maximum input high current (in uA) drawn from USB
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* input
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* @chip_temp_threshold: die temperature where device starts limiting charge
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* current [%100 - %130] (in degree C)
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* @soft_cold_temp_limit: soft cold temperature limit [%0 - %15] (in degree C),
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* granularity is 5 deg C.
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* @soft_hot_temp_limit: soft hot temperature limit [%40 - %55] (in degree C),
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* granularity is 5 deg C.
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* @hard_cold_temp_limit: hard cold temperature limit [%-5 - %10] (in degree C),
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* granularity is 5 deg C.
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* @hard_hot_temp_limit: hard hot temperature limit [%50 - %65] (in degree C),
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* granularity is 5 deg C.
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* @suspend_on_hard_temp_limit: suspend charging when hard limit is hit
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* @soft_temp_limit_compensation: compensation method when soft temperature
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* limit is hit
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* @charge_current_compensation: current (in uA) for charging compensation
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* current when temperature hits soft limits
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* @use_mains: AC/DC input can be used
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* @use_usb: USB input can be used
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* @use_usb_otg: USB OTG output can be used (not implemented yet)
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* @enable_control: how charging enable/disable is controlled
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* (driver/pin controls)
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* @inok_polarity: polarity of INOK signal which denotes presence of external
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* power supply
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*
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* @use_main, @use_usb, and @use_usb_otg are means to enable/disable
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* hardware support for these. This is useful when we want to have for
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* example OTG charging controlled via OTG transceiver driver and not by
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* the SMB347 hardware.
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*
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* Hard and soft temperature limit values are given as described in the
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* device data sheet and assuming NTC beta value is %3750. Even if this is
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* not the case, these values should be used. They can be mapped to the
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* corresponding NTC beta values with the help of table %2 in the data
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* sheet. So for example if NTC beta is %3375 and we want to program hard
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* hot limit to be %53 deg C, @hard_hot_temp_limit should be set to %50.
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*
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* If zero value is given in any of the current and voltage values, the
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* factory programmed default will be used. For soft/hard temperature
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* values, pass in %SMB3XX_TEMP_USE_DEFAULT instead.
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*/
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struct smb347_charger {
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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 regulator_dev *usb_rdev;
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unsigned int id;
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bool mains_online;
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bool usb_online;
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bool irq_unsupported;
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bool usb_vbus_enabled;
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unsigned int max_charge_current;
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unsigned int max_charge_voltage;
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unsigned int pre_charge_current;
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unsigned int termination_current;
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unsigned int pre_to_fast_voltage;
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unsigned int mains_current_limit;
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unsigned int usb_hc_current_limit;
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unsigned int chip_temp_threshold;
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int soft_cold_temp_limit;
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int soft_hot_temp_limit;
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int hard_cold_temp_limit;
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int hard_hot_temp_limit;
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bool suspend_on_hard_temp_limit;
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unsigned int soft_temp_limit_compensation;
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unsigned int charge_current_compensation;
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bool use_mains;
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bool use_usb;
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bool use_usb_otg;
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unsigned int enable_control;
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unsigned int inok_polarity;
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};
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enum smb_charger_chipid {
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SMB345,
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SMB347,
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SMB358,
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NUM_CHIP_TYPES,
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};
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/* Fast charge current in uA */
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static const unsigned int fcc_tbl[NUM_CHIP_TYPES][8] = {
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[SMB345] = { 200000, 450000, 600000, 900000,
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1300000, 1500000, 1800000, 2000000 },
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[SMB347] = { 700000, 900000, 1200000, 1500000,
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1800000, 2000000, 2200000, 2500000 },
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[SMB358] = { 200000, 450000, 600000, 900000,
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1300000, 1500000, 1800000, 2000000 },
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};
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/* Pre-charge current in uA */
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static const unsigned int pcc_tbl[NUM_CHIP_TYPES][4] = {
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[SMB345] = { 150000, 250000, 350000, 450000 },
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[SMB347] = { 100000, 150000, 200000, 250000 },
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[SMB358] = { 150000, 250000, 350000, 450000 },
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};
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/* Termination current in uA */
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static const unsigned int tc_tbl[NUM_CHIP_TYPES][8] = {
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[SMB345] = { 30000, 40000, 60000, 80000,
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100000, 125000, 150000, 200000 },
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[SMB347] = { 37500, 50000, 100000, 150000,
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200000, 250000, 500000, 600000 },
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[SMB358] = { 30000, 40000, 60000, 80000,
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100000, 125000, 150000, 200000 },
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};
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/* Input current limit in uA */
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static const unsigned int icl_tbl[NUM_CHIP_TYPES][10] = {
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[SMB345] = { 300000, 500000, 700000, 1000000, 1500000,
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1800000, 2000000, 2000000, 2000000, 2000000 },
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[SMB347] = { 300000, 500000, 700000, 900000, 1200000,
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1500000, 1800000, 2000000, 2200000, 2500000 },
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[SMB358] = { 300000, 500000, 700000, 1000000, 1500000,
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1800000, 2000000, 2000000, 2000000, 2000000 },
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};
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/* Charge current compensation in uA */
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static const unsigned int ccc_tbl[NUM_CHIP_TYPES][4] = {
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[SMB345] = { 200000, 450000, 600000, 900000 },
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[SMB347] = { 250000, 700000, 900000, 1200000 },
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[SMB358] = { 200000, 450000, 600000, 900000 },
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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->use_mains)
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dc = !(val & IRQSTAT_E_DCIN_UV_STAT);
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if (smb->use_usb)
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usb = !(val & IRQSTAT_E_USBIN_UV_STAT);
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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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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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return smb->usb_online || smb->mains_online;
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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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if (smb->enable_control != SMB3XX_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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if (enable && smb->usb_vbus_enabled) {
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dev_dbg(smb->dev, "charging not enabled because USB is in host mode\n");
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return 0;
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}
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return 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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}
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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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unsigned int id = smb->id;
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int ret;
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if (smb->max_charge_current) {
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ret = current_to_hw(fcc_tbl[id], ARRAY_SIZE(fcc_tbl[id]),
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smb->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->pre_charge_current) {
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ret = current_to_hw(pcc_tbl[id], ARRAY_SIZE(pcc_tbl[id]),
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smb->pre_charge_current);
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if (ret < 0)
|
|
return ret;
|
|
|
|
ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
|
|
CFG_CHARGE_CURRENT_PCC_MASK,
|
|
ret << CFG_CHARGE_CURRENT_PCC_SHIFT);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (smb->termination_current) {
|
|
ret = current_to_hw(tc_tbl[id], ARRAY_SIZE(tc_tbl[id]),
|
|
smb->termination_current);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
|
|
CFG_CHARGE_CURRENT_TC_MASK, ret);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int smb347_set_current_limits(struct smb347_charger *smb)
|
|
{
|
|
unsigned int id = smb->id;
|
|
int ret;
|
|
|
|
if (smb->mains_current_limit) {
|
|
ret = current_to_hw(icl_tbl[id], ARRAY_SIZE(icl_tbl[id]),
|
|
smb->mains_current_limit);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
|
|
CFG_CURRENT_LIMIT_DC_MASK,
|
|
ret << CFG_CURRENT_LIMIT_DC_SHIFT);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (smb->usb_hc_current_limit) {
|
|
ret = current_to_hw(icl_tbl[id], ARRAY_SIZE(icl_tbl[id]),
|
|
smb->usb_hc_current_limit);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
|
|
CFG_CURRENT_LIMIT_USB_MASK, ret);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int smb347_set_voltage_limits(struct smb347_charger *smb)
|
|
{
|
|
int ret;
|
|
|
|
if (smb->pre_to_fast_voltage) {
|
|
ret = smb->pre_to_fast_voltage;
|
|
|
|
/* uV */
|
|
ret = clamp_val(ret, 2400000, 3000000) - 2400000;
|
|
ret /= 200000;
|
|
|
|
ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
|
|
CFG_FLOAT_VOLTAGE_THRESHOLD_MASK,
|
|
ret << CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (smb->max_charge_voltage) {
|
|
ret = smb->max_charge_voltage;
|
|
|
|
/* uV */
|
|
ret = clamp_val(ret, 3500000, 4500000) - 3500000;
|
|
ret /= 20000;
|
|
|
|
ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
|
|
CFG_FLOAT_VOLTAGE_FLOAT_MASK, ret);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int smb347_set_temp_limits(struct smb347_charger *smb)
|
|
{
|
|
unsigned int id = smb->id;
|
|
bool enable_therm_monitor = false;
|
|
int ret = 0;
|
|
int val;
|
|
|
|
if (smb->chip_temp_threshold) {
|
|
val = smb->chip_temp_threshold;
|
|
|
|
/* degree C */
|
|
val = clamp_val(val, 100, 130) - 100;
|
|
val /= 10;
|
|
|
|
ret = regmap_update_bits(smb->regmap, CFG_OTG,
|
|
CFG_OTG_TEMP_THRESHOLD_MASK,
|
|
val << CFG_OTG_TEMP_THRESHOLD_SHIFT);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (smb->soft_cold_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {
|
|
val = smb->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->soft_hot_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {
|
|
val = smb->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->hard_cold_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {
|
|
val = smb->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->hard_hot_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {
|
|
val = smb->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->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->soft_temp_limit_compensation !=
|
|
SMB3XX_SOFT_TEMP_COMPENSATE_DEFAULT) {
|
|
val = smb->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->charge_current_compensation) {
|
|
val = current_to_hw(ccc_tbl[id], ARRAY_SIZE(ccc_tbl[id]),
|
|
smb->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,
|
|
bool irq_toggle)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(smb->dev);
|
|
int ret;
|
|
|
|
if (writable && irq_toggle && !smb->irq_unsupported)
|
|
disable_irq(client->irq);
|
|
|
|
ret = regmap_update_bits(smb->regmap, CMD_A, CMD_A_ALLOW_WRITE,
|
|
writable ? CMD_A_ALLOW_WRITE : 0);
|
|
|
|
if ((!writable || ret) && irq_toggle && !smb->irq_unsupported)
|
|
enable_irq(client->irq);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int smb347_hw_init(struct smb347_charger *smb)
|
|
{
|
|
unsigned int val;
|
|
int ret;
|
|
|
|
ret = smb347_set_writable(smb, true, false);
|
|
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->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->use_usb_otg ? CFG_OTHER_RID_ENABLED_AUTO_OTG : 0);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
/* Activate pin control, making it writable. */
|
|
switch (smb->enable_control) {
|
|
case SMB3XX_CHG_ENABLE_PIN_ACTIVE_LOW:
|
|
case SMB3XX_CHG_ENABLE_PIN_ACTIVE_HIGH:
|
|
ret = regmap_set_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CTRL);
|
|
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->enable_control) {
|
|
case SMB3XX_CHG_ENABLE_PIN_ACTIVE_LOW:
|
|
val = CFG_PIN_EN_CTRL_ACTIVE_LOW;
|
|
break;
|
|
case SMB3XX_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, 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;
|
|
|
|
/* SMB347 it needs at least 20ms for setting IRQSTAT_E_*IN_UV_IRQ */
|
|
usleep_range(25000, 35000);
|
|
|
|
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");
|
|
if (smb->use_mains)
|
|
power_supply_changed(smb->mains);
|
|
if (smb->use_usb)
|
|
power_supply_changed(smb->usb);
|
|
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) {
|
|
if (smb->use_mains)
|
|
power_supply_changed(smb->mains);
|
|
if (smb->use_usb)
|
|
power_supply_changed(smb->usb);
|
|
}
|
|
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");
|
|
if (smb->use_mains)
|
|
power_supply_changed(smb->mains);
|
|
if (smb->use_usb)
|
|
power_supply_changed(smb->usb);
|
|
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->use_mains)
|
|
power_supply_changed(smb->mains);
|
|
if (smb->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;
|
|
|
|
if (smb->irq_unsupported)
|
|
return 0;
|
|
|
|
ret = smb347_set_writable(smb, true, 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, true);
|
|
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)
|
|
{
|
|
int ret;
|
|
|
|
smb->irq_unsupported = true;
|
|
|
|
/*
|
|
* Interrupt pin is optional. If it is connected, we setup the
|
|
* interrupt support here.
|
|
*/
|
|
if (!client->irq)
|
|
return 0;
|
|
|
|
ret = smb347_set_writable(smb, true, false);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/*
|
|
* 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);
|
|
|
|
smb347_set_writable(smb, false, false);
|
|
|
|
if (ret < 0) {
|
|
dev_warn(smb->dev, "failed to initialize IRQ: %d\n", ret);
|
|
dev_warn(smb->dev, "disabling IRQ support\n");
|
|
return 0;
|
|
}
|
|
|
|
ret = devm_request_threaded_irq(smb->dev, client->irq, NULL,
|
|
smb347_interrupt, IRQF_ONESHOT,
|
|
client->name, smb);
|
|
if (ret)
|
|
return ret;
|
|
|
|
smb->irq_unsupported = false;
|
|
|
|
ret = smb347_irq_enable(smb);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Returns the constant charge current programmed
|
|
* into the charger in uA.
|
|
*/
|
|
static int get_const_charge_current(struct smb347_charger *smb)
|
|
{
|
|
unsigned int id = smb->id;
|
|
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[id],
|
|
ARRAY_SIZE(fcc_tbl[id]), v & 7);
|
|
} else {
|
|
v >>= 3;
|
|
intval = hw_to_current(pcc_tbl[id],
|
|
ARRAY_SIZE(pcc_tbl[id]), 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_get_charging_status(struct smb347_charger *smb,
|
|
struct power_supply *psy)
|
|
{
|
|
int ret, status;
|
|
unsigned int val;
|
|
|
|
if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
|
|
if (!smb->usb_online)
|
|
return POWER_SUPPLY_STATUS_DISCHARGING;
|
|
} else {
|
|
if (!smb->mains_online)
|
|
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_get_property_locked(struct power_supply *psy,
|
|
enum power_supply_property prop,
|
|
union power_supply_propval *val)
|
|
{
|
|
struct smb347_charger *smb = power_supply_get_drvdata(psy);
|
|
int ret;
|
|
|
|
switch (prop) {
|
|
case POWER_SUPPLY_PROP_STATUS:
|
|
ret = smb347_get_charging_status(smb, psy);
|
|
if (ret < 0)
|
|
return ret;
|
|
val->intval = ret;
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_CHARGE_TYPE:
|
|
if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
|
|
if (!smb->usb_online)
|
|
return -ENODATA;
|
|
} else {
|
|
if (!smb->mains_online)
|
|
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_ONLINE:
|
|
if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
|
|
val->intval = smb->usb_online;
|
|
else
|
|
val->intval = smb->mains_online;
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
|
|
ret = get_const_charge_voltage(smb);
|
|
if (ret < 0)
|
|
return ret;
|
|
val->intval = ret;
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
|
|
ret = get_const_charge_current(smb);
|
|
if (ret < 0)
|
|
return ret;
|
|
val->intval = ret;
|
|
break;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int smb347_get_property(struct power_supply *psy,
|
|
enum power_supply_property prop,
|
|
union power_supply_propval *val)
|
|
{
|
|
struct smb347_charger *smb = power_supply_get_drvdata(psy);
|
|
struct i2c_client *client = to_i2c_client(smb->dev);
|
|
int ret;
|
|
|
|
if (!smb->irq_unsupported)
|
|
disable_irq(client->irq);
|
|
|
|
ret = smb347_get_property_locked(psy, prop, val);
|
|
|
|
if (!smb->irq_unsupported)
|
|
enable_irq(client->irq);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static enum power_supply_property smb347_properties[] = {
|
|
POWER_SUPPLY_PROP_STATUS,
|
|
POWER_SUPPLY_PROP_CHARGE_TYPE,
|
|
POWER_SUPPLY_PROP_ONLINE,
|
|
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
|
|
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
|
|
};
|
|
|
|
static bool smb347_volatile_reg(struct device *dev, unsigned int reg)
|
|
{
|
|
switch (reg) {
|
|
case IRQSTAT_A:
|
|
case IRQSTAT_C:
|
|
case IRQSTAT_D:
|
|
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 void smb347_dt_parse_dev_info(struct smb347_charger *smb)
|
|
{
|
|
struct device *dev = smb->dev;
|
|
|
|
smb->soft_temp_limit_compensation =
|
|
SMB3XX_SOFT_TEMP_COMPENSATE_DEFAULT;
|
|
/*
|
|
* These properties come from the battery info, still we need to
|
|
* pre-initialize the values. See smb347_get_battery_info() below.
|
|
*/
|
|
smb->soft_cold_temp_limit = SMB3XX_TEMP_USE_DEFAULT;
|
|
smb->hard_cold_temp_limit = SMB3XX_TEMP_USE_DEFAULT;
|
|
smb->soft_hot_temp_limit = SMB3XX_TEMP_USE_DEFAULT;
|
|
smb->hard_hot_temp_limit = SMB3XX_TEMP_USE_DEFAULT;
|
|
|
|
/* Charging constraints */
|
|
device_property_read_u32(dev, "summit,fast-voltage-threshold-microvolt",
|
|
&smb->pre_to_fast_voltage);
|
|
device_property_read_u32(dev, "summit,mains-current-limit-microamp",
|
|
&smb->mains_current_limit);
|
|
device_property_read_u32(dev, "summit,usb-current-limit-microamp",
|
|
&smb->usb_hc_current_limit);
|
|
|
|
/* For thermometer monitoring */
|
|
device_property_read_u32(dev, "summit,chip-temperature-threshold-celsius",
|
|
&smb->chip_temp_threshold);
|
|
device_property_read_u32(dev, "summit,soft-compensation-method",
|
|
&smb->soft_temp_limit_compensation);
|
|
device_property_read_u32(dev, "summit,charge-current-compensation-microamp",
|
|
&smb->charge_current_compensation);
|
|
|
|
/* Supported charging mode */
|
|
smb->use_mains = device_property_read_bool(dev, "summit,enable-mains-charging");
|
|
smb->use_usb = device_property_read_bool(dev, "summit,enable-usb-charging");
|
|
smb->use_usb_otg = device_property_read_bool(dev, "summit,enable-otg-charging");
|
|
|
|
/* Select charging control */
|
|
device_property_read_u32(dev, "summit,enable-charge-control",
|
|
&smb->enable_control);
|
|
|
|
/*
|
|
* Polarity of INOK signal indicating presence of external power
|
|
* supply connected to the charger.
|
|
*/
|
|
device_property_read_u32(dev, "summit,inok-polarity",
|
|
&smb->inok_polarity);
|
|
}
|
|
|
|
static int smb347_get_battery_info(struct smb347_charger *smb)
|
|
{
|
|
struct power_supply_battery_info *info;
|
|
struct power_supply *supply;
|
|
int err;
|
|
|
|
if (smb->mains)
|
|
supply = smb->mains;
|
|
else
|
|
supply = smb->usb;
|
|
|
|
err = power_supply_get_battery_info(supply, &info);
|
|
if (err == -ENXIO || err == -ENODEV)
|
|
return 0;
|
|
if (err)
|
|
return err;
|
|
|
|
if (info->constant_charge_current_max_ua != -EINVAL)
|
|
smb->max_charge_current = info->constant_charge_current_max_ua;
|
|
|
|
if (info->constant_charge_voltage_max_uv != -EINVAL)
|
|
smb->max_charge_voltage = info->constant_charge_voltage_max_uv;
|
|
|
|
if (info->precharge_current_ua != -EINVAL)
|
|
smb->pre_charge_current = info->precharge_current_ua;
|
|
|
|
if (info->charge_term_current_ua != -EINVAL)
|
|
smb->termination_current = info->charge_term_current_ua;
|
|
|
|
if (info->temp_alert_min != INT_MIN)
|
|
smb->soft_cold_temp_limit = info->temp_alert_min;
|
|
|
|
if (info->temp_alert_max != INT_MAX)
|
|
smb->soft_hot_temp_limit = info->temp_alert_max;
|
|
|
|
if (info->temp_min != INT_MIN)
|
|
smb->hard_cold_temp_limit = info->temp_min;
|
|
|
|
if (info->temp_max != INT_MAX)
|
|
smb->hard_hot_temp_limit = info->temp_max;
|
|
|
|
/* Suspend when battery temperature is outside hard limits */
|
|
if (smb->hard_cold_temp_limit != SMB3XX_TEMP_USE_DEFAULT ||
|
|
smb->hard_hot_temp_limit != SMB3XX_TEMP_USE_DEFAULT)
|
|
smb->suspend_on_hard_temp_limit = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int smb347_usb_vbus_get_current_limit(struct regulator_dev *rdev)
|
|
{
|
|
struct smb347_charger *smb = rdev_get_drvdata(rdev);
|
|
unsigned int val;
|
|
int ret;
|
|
|
|
ret = regmap_read(smb->regmap, CFG_OTG, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/*
|
|
* It's unknown what happens if this bit is unset due to lack of
|
|
* access to the datasheet, assume it's limit-enable.
|
|
*/
|
|
if (!(val & CFG_OTG_CURRENT_LIMIT_250mA))
|
|
return 0;
|
|
|
|
return val & CFG_OTG_CURRENT_LIMIT_750mA ? 750000 : 250000;
|
|
}
|
|
|
|
static int smb347_usb_vbus_set_new_current_limit(struct smb347_charger *smb,
|
|
int max_uA)
|
|
{
|
|
const unsigned int mask = CFG_OTG_CURRENT_LIMIT_750mA |
|
|
CFG_OTG_CURRENT_LIMIT_250mA;
|
|
unsigned int val = CFG_OTG_CURRENT_LIMIT_250mA;
|
|
int ret;
|
|
|
|
if (max_uA >= 750000)
|
|
val |= CFG_OTG_CURRENT_LIMIT_750mA;
|
|
|
|
ret = regmap_update_bits(smb->regmap, CFG_OTG, mask, val);
|
|
if (ret < 0)
|
|
dev_err(smb->dev, "failed to change USB current limit\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int smb347_usb_vbus_set_current_limit(struct regulator_dev *rdev,
|
|
int min_uA, int max_uA)
|
|
{
|
|
struct smb347_charger *smb = rdev_get_drvdata(rdev);
|
|
int ret;
|
|
|
|
ret = smb347_set_writable(smb, true, true);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = smb347_usb_vbus_set_new_current_limit(smb, max_uA);
|
|
smb347_set_writable(smb, false, true);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int smb347_usb_vbus_regulator_enable(struct regulator_dev *rdev)
|
|
{
|
|
struct smb347_charger *smb = rdev_get_drvdata(rdev);
|
|
int ret, max_uA;
|
|
|
|
ret = smb347_set_writable(smb, true, true);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
smb347_charging_disable(smb);
|
|
|
|
if (device_property_read_bool(&rdev->dev, "summit,needs-inok-toggle")) {
|
|
unsigned int sysok = 0;
|
|
|
|
if (smb->inok_polarity == SMB3XX_SYSOK_INOK_ACTIVE_LOW)
|
|
sysok = CFG_SYSOK_INOK_ACTIVE_HIGH;
|
|
|
|
/*
|
|
* VBUS won't be powered if INOK is active, so we need to
|
|
* manually disable INOK on some platforms.
|
|
*/
|
|
ret = regmap_update_bits(smb->regmap, CFG_SYSOK,
|
|
CFG_SYSOK_INOK_ACTIVE_HIGH, sysok);
|
|
if (ret < 0) {
|
|
dev_err(smb->dev, "failed to disable INOK\n");
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
ret = smb347_usb_vbus_get_current_limit(rdev);
|
|
if (ret < 0) {
|
|
dev_err(smb->dev, "failed to get USB VBUS current limit\n");
|
|
goto done;
|
|
}
|
|
|
|
max_uA = ret;
|
|
|
|
ret = smb347_usb_vbus_set_new_current_limit(smb, 250000);
|
|
if (ret < 0) {
|
|
dev_err(smb->dev, "failed to preset USB VBUS current limit\n");
|
|
goto done;
|
|
}
|
|
|
|
ret = regmap_set_bits(smb->regmap, CMD_A, CMD_A_OTG_ENABLED);
|
|
if (ret < 0) {
|
|
dev_err(smb->dev, "failed to enable USB VBUS\n");
|
|
goto done;
|
|
}
|
|
|
|
smb->usb_vbus_enabled = true;
|
|
|
|
ret = smb347_usb_vbus_set_new_current_limit(smb, max_uA);
|
|
if (ret < 0) {
|
|
dev_err(smb->dev, "failed to restore USB VBUS current limit\n");
|
|
goto done;
|
|
}
|
|
done:
|
|
smb347_set_writable(smb, false, true);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int smb347_usb_vbus_regulator_disable(struct regulator_dev *rdev)
|
|
{
|
|
struct smb347_charger *smb = rdev_get_drvdata(rdev);
|
|
int ret;
|
|
|
|
ret = smb347_set_writable(smb, true, true);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = regmap_clear_bits(smb->regmap, CMD_A, CMD_A_OTG_ENABLED);
|
|
if (ret < 0) {
|
|
dev_err(smb->dev, "failed to disable USB VBUS\n");
|
|
goto done;
|
|
}
|
|
|
|
smb->usb_vbus_enabled = false;
|
|
|
|
if (device_property_read_bool(&rdev->dev, "summit,needs-inok-toggle")) {
|
|
unsigned int sysok = 0;
|
|
|
|
if (smb->inok_polarity == SMB3XX_SYSOK_INOK_ACTIVE_HIGH)
|
|
sysok = CFG_SYSOK_INOK_ACTIVE_HIGH;
|
|
|
|
ret = regmap_update_bits(smb->regmap, CFG_SYSOK,
|
|
CFG_SYSOK_INOK_ACTIVE_HIGH, sysok);
|
|
if (ret < 0) {
|
|
dev_err(smb->dev, "failed to enable INOK\n");
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
smb347_start_stop_charging(smb);
|
|
done:
|
|
smb347_set_writable(smb, false, true);
|
|
|
|
return ret;
|
|
}
|
|
|
|
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,
|
|
.cache_type = REGCACHE_RBTREE,
|
|
};
|
|
|
|
static const struct regulator_ops smb347_usb_vbus_regulator_ops = {
|
|
.is_enabled = regulator_is_enabled_regmap,
|
|
.enable = smb347_usb_vbus_regulator_enable,
|
|
.disable = smb347_usb_vbus_regulator_disable,
|
|
.get_current_limit = smb347_usb_vbus_get_current_limit,
|
|
.set_current_limit = smb347_usb_vbus_set_current_limit,
|
|
};
|
|
|
|
static const struct power_supply_desc smb347_mains_desc = {
|
|
.name = "smb347-mains",
|
|
.type = POWER_SUPPLY_TYPE_MAINS,
|
|
.get_property = smb347_get_property,
|
|
.properties = smb347_properties,
|
|
.num_properties = ARRAY_SIZE(smb347_properties),
|
|
};
|
|
|
|
static const struct power_supply_desc smb347_usb_desc = {
|
|
.name = "smb347-usb",
|
|
.type = POWER_SUPPLY_TYPE_USB,
|
|
.get_property = smb347_get_property,
|
|
.properties = smb347_properties,
|
|
.num_properties = ARRAY_SIZE(smb347_properties),
|
|
};
|
|
|
|
static const struct regulator_desc smb347_usb_vbus_regulator_desc = {
|
|
.name = "smb347-usb-vbus",
|
|
.of_match = of_match_ptr("usb-vbus"),
|
|
.ops = &smb347_usb_vbus_regulator_ops,
|
|
.type = REGULATOR_VOLTAGE,
|
|
.owner = THIS_MODULE,
|
|
.enable_reg = CMD_A,
|
|
.enable_mask = CMD_A_OTG_ENABLED,
|
|
.enable_val = CMD_A_OTG_ENABLED,
|
|
.fixed_uV = 5000000,
|
|
.n_voltages = 1,
|
|
};
|
|
|
|
static int smb347_probe(struct i2c_client *client)
|
|
{
|
|
const struct i2c_device_id *id = i2c_client_get_device_id(client);
|
|
struct power_supply_config mains_usb_cfg = {};
|
|
struct regulator_config usb_rdev_cfg = {};
|
|
struct device *dev = &client->dev;
|
|
struct smb347_charger *smb;
|
|
int ret;
|
|
|
|
smb = devm_kzalloc(dev, sizeof(*smb), GFP_KERNEL);
|
|
if (!smb)
|
|
return -ENOMEM;
|
|
smb->dev = &client->dev;
|
|
smb->id = id->driver_data;
|
|
i2c_set_clientdata(client, smb);
|
|
|
|
smb347_dt_parse_dev_info(smb);
|
|
if (!smb->use_mains && !smb->use_usb)
|
|
return -EINVAL;
|
|
|
|
smb->regmap = devm_regmap_init_i2c(client, &smb347_regmap);
|
|
if (IS_ERR(smb->regmap))
|
|
return PTR_ERR(smb->regmap);
|
|
|
|
mains_usb_cfg.drv_data = smb;
|
|
mains_usb_cfg.of_node = dev->of_node;
|
|
if (smb->use_mains) {
|
|
smb->mains = devm_power_supply_register(dev, &smb347_mains_desc,
|
|
&mains_usb_cfg);
|
|
if (IS_ERR(smb->mains))
|
|
return PTR_ERR(smb->mains);
|
|
}
|
|
|
|
if (smb->use_usb) {
|
|
smb->usb = devm_power_supply_register(dev, &smb347_usb_desc,
|
|
&mains_usb_cfg);
|
|
if (IS_ERR(smb->usb))
|
|
return PTR_ERR(smb->usb);
|
|
}
|
|
|
|
ret = smb347_get_battery_info(smb);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = smb347_hw_init(smb);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = smb347_irq_init(smb, client);
|
|
if (ret)
|
|
return ret;
|
|
|
|
usb_rdev_cfg.dev = dev;
|
|
usb_rdev_cfg.driver_data = smb;
|
|
usb_rdev_cfg.regmap = smb->regmap;
|
|
|
|
smb->usb_rdev = devm_regulator_register(dev,
|
|
&smb347_usb_vbus_regulator_desc,
|
|
&usb_rdev_cfg);
|
|
if (IS_ERR(smb->usb_rdev)) {
|
|
smb347_irq_disable(smb);
|
|
return PTR_ERR(smb->usb_rdev);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void smb347_remove(struct i2c_client *client)
|
|
{
|
|
struct smb347_charger *smb = i2c_get_clientdata(client);
|
|
|
|
smb347_usb_vbus_regulator_disable(smb->usb_rdev);
|
|
smb347_irq_disable(smb);
|
|
}
|
|
|
|
static void smb347_shutdown(struct i2c_client *client)
|
|
{
|
|
smb347_remove(client);
|
|
}
|
|
|
|
static const struct i2c_device_id smb347_id[] = {
|
|
{ "smb345", SMB345 },
|
|
{ "smb347", SMB347 },
|
|
{ "smb358", SMB358 },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, smb347_id);
|
|
|
|
static const struct of_device_id smb3xx_of_match[] = {
|
|
{ .compatible = "summit,smb345" },
|
|
{ .compatible = "summit,smb347" },
|
|
{ .compatible = "summit,smb358" },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, smb3xx_of_match);
|
|
|
|
static struct i2c_driver smb347_driver = {
|
|
.driver = {
|
|
.name = "smb347",
|
|
.of_match_table = smb3xx_of_match,
|
|
},
|
|
.probe_new = smb347_probe,
|
|
.remove = smb347_remove,
|
|
.shutdown = smb347_shutdown,
|
|
.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");
|