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ed1a230f96
Driver support for the Summit I²C battery charger. This is used in some Intel devices. Signed-off-by: Bruce E. Robertson <bruce.e.robertson@intel.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
118 lines
4.5 KiB
C
118 lines
4.5 KiB
C
/*
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* Summit Microelectronics SMB347 Battery Charger Driver
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*
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* Copyright (C) 2011, Intel Corporation
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*
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* Authors: Bruce E. Robertson <bruce.e.robertson@intel.com>
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* Mika Westerberg <mika.westerberg@linux.intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef SMB347_CHARGER_H
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#define SMB347_CHARGER_H
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#include <linux/types.h>
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#include <linux/power_supply.h>
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enum {
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/* use the default compensation method */
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SMB347_SOFT_TEMP_COMPENSATE_DEFAULT = -1,
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SMB347_SOFT_TEMP_COMPENSATE_NONE,
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SMB347_SOFT_TEMP_COMPENSATE_CURRENT,
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SMB347_SOFT_TEMP_COMPENSATE_VOLTAGE,
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};
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/* Use default factory programmed value for hard/soft temperature limit */
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#define SMB347_TEMP_USE_DEFAULT -273
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/*
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* Charging enable can be controlled by software (via i2c) by
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* smb347-charger driver or by EN pin (active low/high).
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*/
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enum smb347_chg_enable {
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SMB347_CHG_ENABLE_SW,
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SMB347_CHG_ENABLE_PIN_ACTIVE_LOW,
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SMB347_CHG_ENABLE_PIN_ACTIVE_HIGH,
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};
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/**
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* struct smb347_charger_platform_data - platform data for SMB347 charger
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* @battery_info: Information about the battery
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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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* @irq_gpio: GPIO number used for interrupts (%-1 if not used)
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* @enable_control: how charging enable/disable is controlled
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* (driver/pin controls)
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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 %SMB347_TEMP_USE_DEFAULT instead.
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*/
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struct smb347_charger_platform_data {
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struct power_supply_info battery_info;
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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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int irq_gpio;
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enum smb347_chg_enable enable_control;
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};
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#endif /* SMB347_CHARGER_H */
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