diff options
Diffstat (limited to 'driver/charger/bq24717.c')
| -rw-r--r-- | driver/charger/bq24717.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/driver/charger/bq24717.c b/driver/charger/bq24717.c new file mode 100644 index 0000000000..3ec7bb6fad --- /dev/null +++ b/driver/charger/bq24717.c @@ -0,0 +1,223 @@ +/* Copyright (c) 2015 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + * + * TI bq24717 battery charger driver. + */ + +#include "battery_smart.h" +#include "bq24717.h" +#include "charger.h" +#include "console.h" +#include "common.h" +#include "util.h" + +/* Sense resistor configurations and macros */ +#define DEFAULT_SENSE_RESISTOR 10 +#define R_SNS CONFIG_CHARGER_SENSE_RESISTOR +#define R_AC CONFIG_CHARGER_SENSE_RESISTOR_AC +#define REG_TO_CURRENT(REG, RS) ((REG) * DEFAULT_SENSE_RESISTOR / (RS)) +#define CURRENT_TO_REG(CUR, RS) ((CUR) * (RS) / DEFAULT_SENSE_RESISTOR) + +/* Note: it is assumed that the sense resistors are 10mOhm. */ + +static const struct charger_info bq24717_charger_info = { + .name = "bq24717", + .voltage_max = CHARGE_V_MAX, + .voltage_min = CHARGE_V_MIN, + .voltage_step = CHARGE_V_STEP, + .current_max = REG_TO_CURRENT(CHARGE_I_MAX, R_SNS), + .current_min = REG_TO_CURRENT(CHARGE_I_MIN, R_SNS), + .current_step = REG_TO_CURRENT(CHARGE_I_STEP, R_SNS), + .input_current_max = REG_TO_CURRENT(INPUT_I_MAX, R_AC), + .input_current_min = REG_TO_CURRENT(INPUT_I_MIN, R_AC), + .input_current_step = REG_TO_CURRENT(INPUT_I_STEP, R_AC), +}; + +int charger_set_input_current(int input_current) +{ + return sbc_write(BQ24717_INPUT_CURRENT, + CURRENT_TO_REG(input_current, R_AC)); +} + +int charger_get_input_current(int *input_current) +{ + int rv; + int reg; + + rv = sbc_read(BQ24717_INPUT_CURRENT, ®); + if (rv) + return rv; + + *input_current = REG_TO_CURRENT(reg, R_AC); + + return EC_SUCCESS; +} + +int charger_manufacturer_id(int *id) +{ + return sbc_read(BQ24717_MANUFACTURER_ID, id); +} + +int charger_device_id(int *id) +{ + return sbc_read(BQ24717_DEVICE_ID, id); +} + +int charger_get_option(int *option) +{ + return sbc_read(BQ24717_CHARGE_OPTION, option); +} + +int charger_set_option(int option) +{ + return sbc_write(BQ24717_CHARGE_OPTION, option); +} + +/* Charger interfaces */ + +const struct charger_info *charger_get_info(void) +{ + return &bq24717_charger_info; +} + +int charger_get_status(int *status) +{ + int rv; + int option; + + rv = charger_get_option(&option); + if (rv) + return rv; + + /* Default status */ + *status = CHARGER_LEVEL_2; + + if ((option & OPT_CHARGE_INHIBIT_MASK) == OPT_CHARGE_DISABLE) + *status |= CHARGER_CHARGE_INHIBITED; + + return EC_SUCCESS; +} + +int charger_set_mode(int mode) +{ + int rv; + int option; + + rv = charger_get_option(&option); + if (rv) + return rv; + + option &= ~OPT_CHARGE_INHIBIT_MASK; + if (mode & CHARGE_FLAG_INHIBIT_CHARGE) + option |= OPT_CHARGE_DISABLE; + else + option |= OPT_CHARGE_ENABLE; + return charger_set_option(option); +} + +int charger_get_current(int *current) +{ + int rv; + int reg; + + rv = sbc_read(SB_CHARGING_CURRENT, ®); + if (rv) + return rv; + + *current = REG_TO_CURRENT(reg, R_SNS); + return EC_SUCCESS; +} + +int charger_set_current(int current) +{ + current = charger_closest_current(current); + + return sbc_write(SB_CHARGING_CURRENT, CURRENT_TO_REG(current, R_SNS)); +} + +/* The voltage setting needs to be cached to work with the current + * charging infrastructure and state machine. The reason is that + * the state machine expects to be able to set a 0V charging voltage. + * The bq24717 does not allow this in the hardware register. Therefore + * 0V is handled specially to appease the state machine. */ +static int cached_voltage; + +int charger_get_voltage(int *voltage) +{ + int ret; + + if (cached_voltage == 0) { + *voltage = cached_voltage; + return EC_SUCCESS; + } + + ret = sbc_read(SB_CHARGING_VOLTAGE, &cached_voltage); + + if (ret == EC_SUCCESS) + *voltage = cached_voltage; + + return ret; +} + +int charger_set_voltage(int voltage) +{ + cached_voltage = voltage; + +#ifdef CONFIG_CHARGE_NVDC_OFF_VOLTAGE + if (voltage == 0) + voltage = CONFIG_CHARGE_NVDC_OFF_VOLTAGE; +#endif + + return sbc_write(SB_CHARGING_VOLTAGE, voltage); +} + +/* Charging power state initialization */ +int charger_post_init(void) +{ + int rv; + int option; + + rv = charger_get_option(&option); + if (rv) + return rv; + + /* Ensure 40KHz audio frequency limit is not set */ + option &= ~OPT_AUDIO_FREQ_LIMIT_MASK; + + /* Always monitor adapter current (40X multiplier). */ + option |= OPT_FIX_IOUT_ALWAYS; + option &= ~OPT_IOUT_MASK; + + /* Ensure learn mode is disabled */ + option &= ~OPT_LEARN_MASK; + + /* Enable dynamic power management */ + option |= OPT_IDPM_ENABLE; + + rv = charger_set_option(option); + if (rv) + return rv; + + rv = charger_set_input_current(CONFIG_CHARGER_INPUT_CURRENT); + return rv; +} + +int charger_discharge_on_ac(int enable) +{ + int rv; + int option; + + rv = charger_get_option(&option); + if (rv) + return rv; + + option &= ~OPT_LEARN_MASK; + if (enable) + option |= OPT_LEARN_ENABLE; + else + option |= OPT_LEARN_DISABLE; + rv = charger_set_option(option); + + return rv; +} |