diff options
Diffstat (limited to 'driver/charger/bq24735.c')
| -rw-r--r-- | driver/charger/bq24735.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/driver/charger/bq24735.c b/driver/charger/bq24735.c new file mode 100644 index 0000000000..829bbd41a4 --- /dev/null +++ b/driver/charger/bq24735.c @@ -0,0 +1,183 @@ +/* Copyright (c) 2014 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 bq24735 battery charger driver. + */ + +#include "battery_smart.h" +#include "bq24735.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) + +/* Charger infomation + * charge voltage bitmask: 0111 1111 1111 0000 + * charge current bitmask: 0001 1111 1000 0000 + * input current bitmask : 0000 0000 1000 0000 + */ +static const struct charger_info bq24735_charger_info = { + .name = "bq24735", + .voltage_max = 19200, + .voltage_min = 1024, + .voltage_step = 16, + .current_max = REG_TO_CURRENT(8128, R_SNS), + .current_min = REG_TO_CURRENT(128, R_SNS), + .current_step = REG_TO_CURRENT(128, R_SNS), + .input_current_max = REG_TO_CURRENT(8064, R_AC), + .input_current_min = REG_TO_CURRENT(128, R_AC), + .input_current_step = REG_TO_CURRENT(128, R_AC), +}; + +/* bq24735 specific interfaces */ + +int charger_set_input_current(int input_current) +{ + return sbc_write(BQ24735_INPUT_CURRENT, + CURRENT_TO_REG(input_current, R_AC)); +} + +int charger_get_input_current(int *input_current) +{ + int rv; + int reg; + + rv = sbc_read(BQ24735_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(BQ24735_MANUFACTURE_ID, id); +} + +int charger_device_id(int *id) +{ + return sbc_read(BQ24735_DEVICE_ID, id); +} + +int charger_get_option(int *option) +{ + return sbc_read(BQ24735_CHARGE_OPTION, option); +} + +int charger_set_option(int option) +{ + return sbc_write(BQ24735_CHARGE_OPTION, option); +} + +/* Charger interfaces */ + +const struct charger_info *charger_get_info(void) +{ + return &bq24735_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 & OPTION_CHARGE_INHIBIT) + *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; + + if (mode & CHARGE_FLAG_INHIBIT_CHARGE) + option |= OPTION_CHARGE_INHIBIT; + else + option &= ~OPTION_CHARGE_INHIBIT; + 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)); +} + +int charger_get_voltage(int *voltage) +{ + return sbc_read(SB_CHARGING_VOLTAGE, voltage); +} + +int charger_set_voltage(int voltage) +{ + return sbc_write(SB_CHARGING_VOLTAGE, voltage); +} + +/* Charging power state initialization */ +int charger_post_init(void) +{ + /* + * Note: bq24735 power on reset state is: + * watch dog timer = 175 sec + * input current limit = ~1/2 maximum setting + * charging voltage = 0 mV + * charging current = 0 mA + */ + + /* Set charger input current limit */ + return charger_set_input_current(CONFIG_CHARGER_INPUT_CURRENT); +} + +int charger_discharge_on_ac(int enable) +{ + int rv; + int option; + + rv = charger_get_option(&option); + if (rv) + return rv; + + if (enable) + rv = charger_set_option(option | OPTION_LEARN_ENABLE); + else + rv = charger_set_option(option & ~OPTION_LEARN_ENABLE); + + return rv; +} |