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1645 lines
43 KiB
1645 lines
43 KiB
// 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 <[email protected]> |
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* Mika Westerberg <[email protected]> |
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*/ |
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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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/* |
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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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|
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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) |
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return ret; |
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ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT, |
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CFG_CHARGE_CURRENT_PCC_MASK, |
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ret << CFG_CHARGE_CURRENT_PCC_SHIFT); |
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if (ret < 0) |
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return ret; |
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} |
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|
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if (smb->termination_current) { |
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ret = current_to_hw(tc_tbl[id], ARRAY_SIZE(tc_tbl[id]), |
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smb->termination_current); |
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if (ret < 0) |
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return ret; |
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|
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ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT, |
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CFG_CHARGE_CURRENT_TC_MASK, ret); |
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if (ret < 0) |
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return ret; |
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} |
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|
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return 0; |
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} |
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static int smb347_set_current_limits(struct smb347_charger *smb) |
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{ |
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unsigned int id = smb->id; |
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int ret; |
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|
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if (smb->mains_current_limit) { |
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ret = current_to_hw(icl_tbl[id], ARRAY_SIZE(icl_tbl[id]), |
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smb->mains_current_limit); |
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if (ret < 0) |
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return ret; |
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|
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ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT, |
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CFG_CURRENT_LIMIT_DC_MASK, |
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ret << CFG_CURRENT_LIMIT_DC_SHIFT); |
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if (ret < 0) |
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return ret; |
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} |
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|
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if (smb->usb_hc_current_limit) { |
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ret = current_to_hw(icl_tbl[id], ARRAY_SIZE(icl_tbl[id]), |
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smb->usb_hc_current_limit); |
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if (ret < 0) |
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return ret; |
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|
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ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT, |
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CFG_CURRENT_LIMIT_USB_MASK, ret); |
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if (ret < 0) |
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return ret; |
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} |
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|
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return 0; |
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} |
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|
|
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_FLAT, |
|
.num_reg_defaults_raw = SMB347_MAX_REGISTER, |
|
}; |
|
|
|
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) |
|
{ |
|
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 int 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); |
|
|
|
return 0; |
|
} |
|
|
|
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); |
|
|
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static struct i2c_driver smb347_driver = { |
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.driver = { |
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.name = "smb347", |
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.of_match_table = smb3xx_of_match, |
|
}, |
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.probe = smb347_probe, |
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.remove = smb347_remove, |
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.shutdown = smb347_shutdown, |
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.id_table = smb347_id, |
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}; |
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module_i2c_driver(smb347_driver); |
|
|
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MODULE_AUTHOR("Bruce E. Robertson <[email protected]>"); |
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MODULE_AUTHOR("Mika Westerberg <[email protected]>"); |
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MODULE_DESCRIPTION("SMB347 battery charger driver"); |
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MODULE_LICENSE("GPL");
|
|
|