diff options
Diffstat (limited to 'drivers/power/supply/bd99954-charger.c')
| -rw-r--r-- | drivers/power/supply/bd99954-charger.c | 1144 |
1 files changed, 1144 insertions, 0 deletions
diff --git a/drivers/power/supply/bd99954-charger.c b/drivers/power/supply/bd99954-charger.c new file mode 100644 index 000000000..96e93e1b8 --- /dev/null +++ b/drivers/power/supply/bd99954-charger.c @@ -0,0 +1,1144 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ROHM BD99954 charger driver + * + * Copyright (C) 2020 Rohm Semiconductors + * Originally written by: + * Mikko Mutanen <mikko.mutanen@fi.rohmeurope.com> + * Markus Laine <markus.laine@fi.rohmeurope.com> + * Bugs added by: + * Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> + */ + +/* + * The battery charging profile of BD99954. + * + * Curve (1) represents charging current. + * Curve (2) represents battery voltage. + * + * The BD99954 data sheet divides charging to three phases. + * a) Trickle-charge with constant current (8). + * b) pre-charge with constant current (6) + * c) fast-charge, first with constant current (5) phase. After + * the battery voltage has reached target level (4) we have constant + * voltage phase until charging current has dropped to termination + * level (7) + * + * V ^ ^ I + * . . + * . . + *(4)` `.` ` ` ` ` ` ` ` ` ` ` ` ` ` ----------------------------. + * . :/ . + * . o----+/:/ ` ` ` ` ` ` ` ` ` ` ` ` `.` ` (5) + * . + :: + . + * . + /- -- . + * . +`/- + . + * . o/- -: . + * . .s. +` . + * . .--+ `/ . + * . ..`` + .: . + * . -` + -- . + * . (2) ...`` + :- . + * . ...`` + -: . + *(3)` `.`."" ` ` ` `+-------- ` ` ` ` ` ` `.:` ` ` ` ` ` ` ` ` .` ` (6) + * . + `:. . + * . + -: . + * . + -:. . + * . + .--. . + * . (1) + `.+` ` ` `.` ` (7) + * -..............` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` + ` ` ` .` ` (8) + * . + - + * -------------------------------------------------+++++++++--> + * | trickle | pre | fast | + * + * Details of DT properties for different limits can be found from BD99954 + * device tree binding documentation. + */ + +#include <linux/delay.h> +#include <linux/gpio/consumer.h> +#include <linux/interrupt.h> +#include <linux/i2c.h> +#include <linux/kernel.h> +#include <linux/linear_range.h> +#include <linux/module.h> +#include <linux/mod_devicetable.h> +#include <linux/power_supply.h> +#include <linux/property.h> +#include <linux/regmap.h> +#include <linux/types.h> + +#include "bd99954-charger.h" + +struct battery_data { + u16 precharge_current; /* Trickle-charge Current */ + u16 fc_reg_voltage; /* Fast Charging Regulation Voltage */ + u16 voltage_min; + u16 voltage_max; +}; + +/* Initial field values, converted to initial register values */ +struct bd9995x_init_data { + u16 vsysreg_set; /* VSYS Regulation Setting */ + u16 ibus_lim_set; /* VBUS input current limitation */ + u16 icc_lim_set; /* VCC/VACP Input Current Limit Setting */ + u16 itrich_set; /* Trickle-charge Current Setting */ + u16 iprech_set; /* Pre-Charge Current Setting */ + u16 ichg_set; /* Fast-Charge constant current */ + u16 vfastchg_reg_set1; /* Fast Charging Regulation Voltage */ + u16 vprechg_th_set; /* Pre-charge Voltage Threshold Setting */ + u16 vrechg_set; /* Re-charge Battery Voltage Setting */ + u16 vbatovp_set; /* Battery Over Voltage Threshold Setting */ + u16 iterm_set; /* Charging termination current */ +}; + +struct bd9995x_state { + u8 online; + u16 chgstm_status; + u16 vbat_vsys_status; + u16 vbus_vcc_status; +}; + +struct bd9995x_device { + struct i2c_client *client; + struct device *dev; + struct power_supply *charger; + + struct regmap *rmap; + struct regmap_field *rmap_fields[F_MAX_FIELDS]; + + int chip_id; + int chip_rev; + struct bd9995x_init_data init_data; + struct bd9995x_state state; + + struct mutex lock; /* Protect state data */ +}; + +static const struct regmap_range bd9995x_readonly_reg_ranges[] = { + regmap_reg_range(CHGSTM_STATUS, SEL_ILIM_VAL), + regmap_reg_range(IOUT_DACIN_VAL, IOUT_DACIN_VAL), + regmap_reg_range(VCC_UCD_STATUS, VCC_IDD_STATUS), + regmap_reg_range(VBUS_UCD_STATUS, VBUS_IDD_STATUS), + regmap_reg_range(CHIP_ID, CHIP_REV), + regmap_reg_range(SYSTEM_STATUS, SYSTEM_STATUS), + regmap_reg_range(IBATP_VAL, VBAT_AVE_VAL), + regmap_reg_range(VTH_VAL, EXTIADP_AVE_VAL), +}; + +static const struct regmap_access_table bd9995x_writeable_regs = { + .no_ranges = bd9995x_readonly_reg_ranges, + .n_no_ranges = ARRAY_SIZE(bd9995x_readonly_reg_ranges), +}; + +static const struct regmap_range bd9995x_volatile_reg_ranges[] = { + regmap_reg_range(CHGSTM_STATUS, WDT_STATUS), + regmap_reg_range(VCC_UCD_STATUS, VCC_IDD_STATUS), + regmap_reg_range(VBUS_UCD_STATUS, VBUS_IDD_STATUS), + regmap_reg_range(INT0_STATUS, INT7_STATUS), + regmap_reg_range(SYSTEM_STATUS, SYSTEM_CTRL_SET), + regmap_reg_range(IBATP_VAL, EXTIADP_AVE_VAL), /* Measurement regs */ +}; + +static const struct regmap_access_table bd9995x_volatile_regs = { + .yes_ranges = bd9995x_volatile_reg_ranges, + .n_yes_ranges = ARRAY_SIZE(bd9995x_volatile_reg_ranges), +}; + +static const struct regmap_range_cfg regmap_range_cfg[] = { + { + .selector_reg = MAP_SET, + .selector_mask = 0xFFFF, + .selector_shift = 0, + .window_start = 0, + .window_len = 0x100, + .range_min = 0 * 0x100, + .range_max = 3 * 0x100, + }, +}; + +static const struct regmap_config bd9995x_regmap_config = { + .reg_bits = 8, + .val_bits = 16, + .reg_stride = 1, + + .max_register = 3 * 0x100, + .cache_type = REGCACHE_RBTREE, + + .ranges = regmap_range_cfg, + .num_ranges = ARRAY_SIZE(regmap_range_cfg), + .val_format_endian = REGMAP_ENDIAN_LITTLE, + .wr_table = &bd9995x_writeable_regs, + .volatile_table = &bd9995x_volatile_regs, +}; + +enum bd9995x_chrg_fault { + CHRG_FAULT_NORMAL, + CHRG_FAULT_INPUT, + CHRG_FAULT_THERMAL_SHUTDOWN, + CHRG_FAULT_TIMER_EXPIRED, +}; + +static int bd9995x_get_prop_batt_health(struct bd9995x_device *bd) +{ + int ret, tmp; + + ret = regmap_field_read(bd->rmap_fields[F_BATTEMP], &tmp); + if (ret) + return POWER_SUPPLY_HEALTH_UNKNOWN; + + /* TODO: Check these against datasheet page 34 */ + + switch (tmp) { + case ROOM: + return POWER_SUPPLY_HEALTH_GOOD; + case HOT1: + case HOT2: + case HOT3: + return POWER_SUPPLY_HEALTH_OVERHEAT; + case COLD1: + case COLD2: + return POWER_SUPPLY_HEALTH_COLD; + case TEMP_DIS: + case BATT_OPEN: + default: + return POWER_SUPPLY_HEALTH_UNKNOWN; + } +} + +static int bd9995x_get_prop_charge_type(struct bd9995x_device *bd) +{ + int ret, tmp; + + ret = regmap_field_read(bd->rmap_fields[F_CHGSTM_STATE], &tmp); + if (ret) + return POWER_SUPPLY_CHARGE_TYPE_UNKNOWN; + + switch (tmp) { + case CHGSTM_TRICKLE_CHARGE: + case CHGSTM_PRE_CHARGE: + return POWER_SUPPLY_CHARGE_TYPE_TRICKLE; + case CHGSTM_FAST_CHARGE: + return POWER_SUPPLY_CHARGE_TYPE_FAST; + case CHGSTM_TOP_OFF: + case CHGSTM_DONE: + case CHGSTM_SUSPEND: + return POWER_SUPPLY_CHARGE_TYPE_NONE; + default: /* Rest of the states are error related, no charging */ + return POWER_SUPPLY_CHARGE_TYPE_NONE; + } +} + +static bool bd9995x_get_prop_batt_present(struct bd9995x_device *bd) +{ + int ret, tmp; + + ret = regmap_field_read(bd->rmap_fields[F_BATTEMP], &tmp); + if (ret) + return false; + + return tmp != BATT_OPEN; +} + +static int bd9995x_get_prop_batt_voltage(struct bd9995x_device *bd) +{ + int ret, tmp; + + ret = regmap_field_read(bd->rmap_fields[F_VBAT_VAL], &tmp); + if (ret) + return 0; + + tmp = min(tmp, 19200); + + return tmp * 1000; +} + +static int bd9995x_get_prop_batt_current(struct bd9995x_device *bd) +{ + int ret, tmp; + + ret = regmap_field_read(bd->rmap_fields[F_IBATP_VAL], &tmp); + if (ret) + return 0; + + return tmp * 1000; +} + +#define DEFAULT_BATTERY_TEMPERATURE 250 + +static int bd9995x_get_prop_batt_temp(struct bd9995x_device *bd) +{ + int ret, tmp; + + ret = regmap_field_read(bd->rmap_fields[F_THERM_VAL], &tmp); + if (ret) + return DEFAULT_BATTERY_TEMPERATURE; + + return (200 - tmp) * 10; +} + +static int bd9995x_power_supply_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + int ret, tmp; + struct bd9995x_device *bd = power_supply_get_drvdata(psy); + struct bd9995x_state state; + + mutex_lock(&bd->lock); + state = bd->state; + mutex_unlock(&bd->lock); + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + switch (state.chgstm_status) { + case CHGSTM_TRICKLE_CHARGE: + case CHGSTM_PRE_CHARGE: + case CHGSTM_FAST_CHARGE: + case CHGSTM_TOP_OFF: + val->intval = POWER_SUPPLY_STATUS_CHARGING; + break; + + case CHGSTM_DONE: + val->intval = POWER_SUPPLY_STATUS_FULL; + break; + + case CHGSTM_SUSPEND: + case CHGSTM_TEMPERATURE_ERROR_1: + case CHGSTM_TEMPERATURE_ERROR_2: + case CHGSTM_TEMPERATURE_ERROR_3: + case CHGSTM_TEMPERATURE_ERROR_4: + case CHGSTM_TEMPERATURE_ERROR_5: + case CHGSTM_TEMPERATURE_ERROR_6: + case CHGSTM_TEMPERATURE_ERROR_7: + case CHGSTM_THERMAL_SHUT_DOWN_1: + case CHGSTM_THERMAL_SHUT_DOWN_2: + case CHGSTM_THERMAL_SHUT_DOWN_3: + case CHGSTM_THERMAL_SHUT_DOWN_4: + case CHGSTM_THERMAL_SHUT_DOWN_5: + case CHGSTM_THERMAL_SHUT_DOWN_6: + case CHGSTM_THERMAL_SHUT_DOWN_7: + case CHGSTM_BATTERY_ERROR: + val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; + break; + + default: + val->intval = POWER_SUPPLY_STATUS_UNKNOWN; + break; + } + break; + + case POWER_SUPPLY_PROP_MANUFACTURER: + val->strval = BD9995X_MANUFACTURER; + break; + + case POWER_SUPPLY_PROP_ONLINE: + val->intval = state.online; + break; + + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: + ret = regmap_field_read(bd->rmap_fields[F_IBATP_VAL], &tmp); + if (ret) + return ret; + val->intval = tmp * 1000; + break; + + case POWER_SUPPLY_PROP_CHARGE_AVG: + ret = regmap_field_read(bd->rmap_fields[F_IBATP_AVE_VAL], &tmp); + if (ret) + return ret; + val->intval = tmp * 1000; + break; + + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: + /* + * Currently the DT uses this property to give the + * target current for fast-charging constant current phase. + * I think it is correct in a sense. + * + * Yet, this prop we read and return here is the programmed + * safety limit for combined input currents. This feels + * also correct in a sense. + * + * However, this results a mismatch to DT value and value + * read from sysfs. + */ + ret = regmap_field_read(bd->rmap_fields[F_SEL_ILIM_VAL], &tmp); + if (ret) + return ret; + val->intval = tmp * 1000; + break; + + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: + if (!state.online) { + val->intval = 0; + break; + } + + ret = regmap_field_read(bd->rmap_fields[F_VFASTCHG_REG_SET1], + &tmp); + if (ret) + return ret; + + /* + * The actual range : 2560 to 19200 mV. No matter what the + * register says + */ + val->intval = clamp_val(tmp << 4, 2560, 19200); + val->intval *= 1000; + break; + + case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: + ret = regmap_field_read(bd->rmap_fields[F_ITERM_SET], &tmp); + if (ret) + return ret; + /* Start step is 64 mA */ + val->intval = tmp << 6; + /* Maximum is 1024 mA - no matter what register says */ + val->intval = min(val->intval, 1024); + val->intval *= 1000; + break; + + /* Battery properties which we access through charger */ + case POWER_SUPPLY_PROP_PRESENT: + val->intval = bd9995x_get_prop_batt_present(bd); + break; + + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + val->intval = bd9995x_get_prop_batt_voltage(bd); + break; + + case POWER_SUPPLY_PROP_CURRENT_NOW: + val->intval = bd9995x_get_prop_batt_current(bd); + break; + + case POWER_SUPPLY_PROP_CHARGE_TYPE: + val->intval = bd9995x_get_prop_charge_type(bd); + break; + + case POWER_SUPPLY_PROP_HEALTH: + val->intval = bd9995x_get_prop_batt_health(bd); + break; + + case POWER_SUPPLY_PROP_TEMP: + val->intval = bd9995x_get_prop_batt_temp(bd); + break; + + case POWER_SUPPLY_PROP_TECHNOLOGY: + val->intval = POWER_SUPPLY_TECHNOLOGY_LION; + break; + + case POWER_SUPPLY_PROP_MODEL_NAME: + val->strval = "bd99954"; + break; + + default: + return -EINVAL; + + } + + return 0; +} + +static int bd9995x_get_chip_state(struct bd9995x_device *bd, + struct bd9995x_state *state) +{ + int i, ret, tmp; + struct { + struct regmap_field *id; + u16 *data; + } state_fields[] = { + { + bd->rmap_fields[F_CHGSTM_STATE], &state->chgstm_status, + }, { + bd->rmap_fields[F_VBAT_VSYS_STATUS], + &state->vbat_vsys_status, + }, { + bd->rmap_fields[F_VBUS_VCC_STATUS], + &state->vbus_vcc_status, + }, + }; + + + for (i = 0; i < ARRAY_SIZE(state_fields); i++) { + ret = regmap_field_read(state_fields[i].id, &tmp); + if (ret) + return ret; + + *state_fields[i].data = tmp; + } + + if (state->vbus_vcc_status & STATUS_VCC_DET || + state->vbus_vcc_status & STATUS_VBUS_DET) + state->online = 1; + else + state->online = 0; + + return 0; +} + +static irqreturn_t bd9995x_irq_handler_thread(int irq, void *private) +{ + struct bd9995x_device *bd = private; + int ret, status, mask, i; + unsigned long tmp; + struct bd9995x_state state; + + /* + * The bd9995x does not seem to generate big amount of interrupts. + * The logic regarding which interrupts can cause relevant + * status changes seem to be pretty complex. + * + * So lets implement really simple and hopefully bullet-proof handler: + * It does not really matter which IRQ we handle, we just go and + * re-read all interesting statuses + give the framework a nudge. + * + * Other option would be building a _complex_ and error prone logic + * trying to decide what could have been changed (resulting this IRQ + * we are now handling). During the normal operation the BD99954 does + * not seem to be generating much of interrupts so benefit from such + * logic would probably be minimal. + */ + + ret = regmap_read(bd->rmap, INT0_STATUS, &status); + if (ret) { + dev_err(bd->dev, "Failed to read IRQ status\n"); + return IRQ_NONE; + } + + ret = regmap_field_read(bd->rmap_fields[F_INT0_SET], &mask); + if (ret) { + dev_err(bd->dev, "Failed to read IRQ mask\n"); + return IRQ_NONE; + } + + /* Handle only IRQs that are not masked */ + status &= mask; + tmp = status; + + /* Lowest bit does not represent any sub-registers */ + tmp >>= 1; + + /* + * Mask and ack IRQs we will handle (+ the idiot bit) + */ + ret = regmap_field_write(bd->rmap_fields[F_INT0_SET], 0); + if (ret) { + dev_err(bd->dev, "Failed to mask F_INT0\n"); + return IRQ_NONE; + } + + ret = regmap_write(bd->rmap, INT0_STATUS, status); + if (ret) { + dev_err(bd->dev, "Failed to ack F_INT0\n"); + goto err_umask; + } + + for_each_set_bit(i, &tmp, 7) { + int sub_status, sub_mask; + int sub_status_reg[] = { + INT1_STATUS, INT2_STATUS, INT3_STATUS, INT4_STATUS, + INT5_STATUS, INT6_STATUS, INT7_STATUS, + }; + struct regmap_field *sub_mask_f[] = { + bd->rmap_fields[F_INT1_SET], + bd->rmap_fields[F_INT2_SET], + bd->rmap_fields[F_INT3_SET], + bd->rmap_fields[F_INT4_SET], + bd->rmap_fields[F_INT5_SET], + bd->rmap_fields[F_INT6_SET], + bd->rmap_fields[F_INT7_SET], + }; + + /* Clear sub IRQs */ + ret = regmap_read(bd->rmap, sub_status_reg[i], &sub_status); + if (ret) { + dev_err(bd->dev, "Failed to read IRQ sub-status\n"); + goto err_umask; + } + + ret = regmap_field_read(sub_mask_f[i], &sub_mask); + if (ret) { + dev_err(bd->dev, "Failed to read IRQ sub-mask\n"); + goto err_umask; + } + + /* Ack active sub-statuses */ + sub_status &= sub_mask; + + ret = regmap_write(bd->rmap, sub_status_reg[i], sub_status); + if (ret) { + dev_err(bd->dev, "Failed to ack sub-IRQ\n"); + goto err_umask; + } + } + + ret = regmap_field_write(bd->rmap_fields[F_INT0_SET], mask); + if (ret) + /* May as well retry once */ + goto err_umask; + + /* Read whole chip state */ + ret = bd9995x_get_chip_state(bd, &state); + if (ret < 0) { + dev_err(bd->dev, "Failed to read chip state\n"); + } else { + mutex_lock(&bd->lock); + bd->state = state; + mutex_unlock(&bd->lock); + + power_supply_changed(bd->charger); + } + + return IRQ_HANDLED; + +err_umask: + ret = regmap_field_write(bd->rmap_fields[F_INT0_SET], mask); + if (ret) + dev_err(bd->dev, + "Failed to un-mask F_INT0 - IRQ permanently disabled\n"); + + return IRQ_NONE; +} + +static int __bd9995x_chip_reset(struct bd9995x_device *bd) +{ + int ret, state; + int rst_check_counter = 10; + u16 tmp = ALLRST | OTPLD; + + ret = regmap_raw_write(bd->rmap, SYSTEM_CTRL_SET, &tmp, 2); + if (ret < 0) + return ret; + + do { + ret = regmap_field_read(bd->rmap_fields[F_OTPLD_STATE], &state); + if (ret) + return ret; + + msleep(10); + } while (state == 0 && --rst_check_counter); + + if (!rst_check_counter) { + dev_err(bd->dev, "chip reset not completed\n"); + return -ETIMEDOUT; + } + + tmp = 0; + ret = regmap_raw_write(bd->rmap, SYSTEM_CTRL_SET, &tmp, 2); + + return ret; +} + +static int bd9995x_hw_init(struct bd9995x_device *bd) +{ + int ret; + int i; + struct bd9995x_state state; + struct bd9995x_init_data *id = &bd->init_data; + + const struct { + enum bd9995x_fields id; + u16 value; + } init_data[] = { + /* Enable the charging trigger after SDP charger attached */ + {F_SDP_CHG_TRIG_EN, 1}, + /* Enable charging trigger after SDP charger attached */ + {F_SDP_CHG_TRIG, 1}, + /* Disable charging trigger by BC1.2 detection */ + {F_VBUS_BC_DISEN, 1}, + /* Disable charging trigger by BC1.2 detection */ + {F_VCC_BC_DISEN, 1}, + /* Disable automatic limitation of the input current */ + {F_ILIM_AUTO_DISEN, 1}, + /* Select current limitation when SDP charger attached*/ + {F_SDP_500_SEL, 1}, + /* Select current limitation when DCP charger attached */ + {F_DCP_2500_SEL, 1}, + {F_VSYSREG_SET, id->vsysreg_set}, + /* Activate USB charging and DC/DC converter */ + {F_USB_SUS, 0}, + /* DCDC clock: 1200 kHz*/ + {F_DCDC_CLK_SEL, 3}, + /* Enable charging */ + {F_CHG_EN, 1}, + /* Disable Input current Limit setting voltage measurement */ + {F_EXTIADPEN, 0}, + /* Disable input current limiting */ + {F_VSYS_PRIORITY, 1}, + {F_IBUS_LIM_SET, id->ibus_lim_set}, + {F_ICC_LIM_SET, id->icc_lim_set}, + /* Charge Termination Current Setting to 0*/ + {F_ITERM_SET, id->iterm_set}, + /* Trickle-charge Current Setting */ + {F_ITRICH_SET, id->itrich_set}, + /* Pre-charge Current setting */ + {F_IPRECH_SET, id->iprech_set}, + /* Fast Charge Current for constant current phase */ + {F_ICHG_SET, id->ichg_set}, + /* Fast Charge Voltage Regulation Setting */ + {F_VFASTCHG_REG_SET1, id->vfastchg_reg_set1}, + /* Set Pre-charge Voltage Threshold for trickle charging. */ + {F_VPRECHG_TH_SET, id->vprechg_th_set}, + {F_VRECHG_SET, id->vrechg_set}, + {F_VBATOVP_SET, id->vbatovp_set}, + /* Reverse buck boost voltage Setting */ + {F_VRBOOST_SET, 0}, + /* Disable fast-charging watchdog */ + {F_WDT_FST, 0}, + /* Disable pre-charging watchdog */ + {F_WDT_PRE, 0}, + /* Power save off */ + {F_POWER_SAVE_MODE, 0}, + {F_INT1_SET, INT1_ALL}, + {F_INT2_SET, INT2_ALL}, + {F_INT3_SET, INT3_ALL}, + {F_INT4_SET, INT4_ALL}, + {F_INT5_SET, INT5_ALL}, + {F_INT6_SET, INT6_ALL}, + {F_INT7_SET, INT7_ALL}, + }; + + /* + * Currently we initialize charger to a known state at startup. + * If we want to allow for example the boot code to initialize + * charger we should get rid of this. + */ + ret = __bd9995x_chip_reset(bd); + if (ret < 0) + return ret; + + /* Initialize currents/voltages and other parameters */ + for (i = 0; i < ARRAY_SIZE(init_data); i++) { + ret = regmap_field_write(bd->rmap_fields[init_data[i].id], + init_data[i].value); + if (ret) { + dev_err(bd->dev, "failed to initialize charger (%d)\n", + ret); + return ret; + } + } + + ret = bd9995x_get_chip_state(bd, &state); + if (ret < 0) + return ret; + + mutex_lock(&bd->lock); + bd->state = state; + mutex_unlock(&bd->lock); + + return 0; +} + +static enum power_supply_property bd9995x_power_supply_props[] = { + POWER_SUPPLY_PROP_MANUFACTURER, + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_ONLINE, + POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, + POWER_SUPPLY_PROP_CHARGE_AVG, + POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, + POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE, + POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT, + /* Battery props we access through charger */ + POWER_SUPPLY_PROP_PRESENT, + POWER_SUPPLY_PROP_VOLTAGE_NOW, + POWER_SUPPLY_PROP_CURRENT_NOW, + POWER_SUPPLY_PROP_CHARGE_TYPE, + POWER_SUPPLY_PROP_HEALTH, + POWER_SUPPLY_PROP_TEMP, + POWER_SUPPLY_PROP_TECHNOLOGY, + POWER_SUPPLY_PROP_MODEL_NAME, +}; + +static const struct power_supply_desc bd9995x_power_supply_desc = { + .name = "bd9995x-charger", + .type = POWER_SUPPLY_TYPE_USB, + .properties = bd9995x_power_supply_props, + .num_properties = ARRAY_SIZE(bd9995x_power_supply_props), + .get_property = bd9995x_power_supply_get_property, +}; + +/* + * Limit configurations for vbus-input-current and vcc-vacp-input-current + * Minimum limit is 0 uA. Max is 511 * 32000 uA = 16352000 uA. This is + * configured by writing a register so that each increment in register + * value equals to 32000 uA limit increment. + * + * Eg, value 0x0 is limit 0, value 0x1 is limit 32000, ... + * Describe the setting in linear_range table. + */ +static const struct linear_range input_current_limit_ranges[] = { + { + .min = 0, + .step = 32000, + .min_sel = 0x0, + .max_sel = 0x1ff, + }, +}; + +/* Possible trickle, pre-charging and termination current values */ +static const struct linear_range charging_current_ranges[] = { + { + .min = 0, + .step = 64000, + .min_sel = 0x0, + .max_sel = 0x10, + }, { + .min = 1024000, + .step = 0, + .min_sel = 0x11, + .max_sel = 0x1f, + }, +}; + +/* + * Fast charging voltage regulation, starting re-charging limit + * and battery over voltage protection have same possible values + */ +static const struct linear_range charge_voltage_regulation_ranges[] = { + { + .min = 2560000, + .step = 0, + .min_sel = 0, + .max_sel = 0xA0, + }, { + .min = 2560000, + .step = 16000, + .min_sel = 0xA0, + .max_sel = 0x4B0, + }, { + .min = 19200000, + .step = 0, + .min_sel = 0x4B0, + .max_sel = 0x7FF, + }, +}; + +/* Possible VSYS voltage regulation values */ +static const struct linear_range vsys_voltage_regulation_ranges[] = { + { + .min = 2560000, + .step = 0, + .min_sel = 0, + .max_sel = 0x28, + }, { + .min = 2560000, + .step = 64000, + .min_sel = 0x28, + .max_sel = 0x12C, + }, { + .min = 19200000, + .step = 0, + .min_sel = 0x12C, + .max_sel = 0x1FF, + }, +}; + +/* Possible settings for switching from trickle to pre-charging limits */ +static const struct linear_range trickle_to_pre_threshold_ranges[] = { + { + .min = 2048000, + .step = 0, + .min_sel = 0, + .max_sel = 0x20, + }, { + .min = 2048000, + .step = 64000, + .min_sel = 0x20, + .max_sel = 0x12C, + }, { + .min = 19200000, + .step = 0, + .min_sel = 0x12C, + .max_sel = 0x1FF + } +}; + +/* Possible current values for fast-charging constant current phase */ +static const struct linear_range fast_charge_current_ranges[] = { + { + .min = 0, + .step = 64000, + .min_sel = 0, + .max_sel = 0xFF, + } +}; + +struct battery_init { + const char *name; + int *info_data; + const struct linear_range *range; + int ranges; + u16 *data; +}; + +struct dt_init { + char *prop; + const struct linear_range *range; + int ranges; + u16 *data; +}; + +static int bd9995x_fw_probe(struct bd9995x_device *bd) +{ + int ret; + struct power_supply_battery_info *info; + u32 property; + int i; + int regval; + bool found; + struct bd9995x_init_data *init = &bd->init_data; + struct battery_init battery_inits[] = { + { + .name = "trickle-charging current", + .range = &charging_current_ranges[0], + .ranges = 2, + .data = &init->itrich_set, + }, { + .name = "pre-charging current", + .range = &charging_current_ranges[0], + .ranges = 2, + .data = &init->iprech_set, + }, { + .name = "pre-to-trickle charge voltage threshold", + .range = &trickle_to_pre_threshold_ranges[0], + .ranges = 2, + .data = &init->vprechg_th_set, + }, { + .name = "charging termination current", + .range = &charging_current_ranges[0], + .ranges = 2, + .data = &init->iterm_set, + }, { + .name = "charging re-start voltage", + .range = &charge_voltage_regulation_ranges[0], + .ranges = 2, + .data = &init->vrechg_set, + }, { + .name = "battery overvoltage limit", + .range = &charge_voltage_regulation_ranges[0], + .ranges = 2, + .data = &init->vbatovp_set, + }, { + .name = "fast-charging max current", + .range = &fast_charge_current_ranges[0], + .ranges = 1, + .data = &init->ichg_set, + }, { + .name = "fast-charging voltage", + .range = &charge_voltage_regulation_ranges[0], + .ranges = 2, + .data = &init->vfastchg_reg_set1, + }, + }; + struct dt_init props[] = { + { + .prop = "rohm,vsys-regulation-microvolt", + .range = &vsys_voltage_regulation_ranges[0], + .ranges = 2, + .data = &init->vsysreg_set, + }, { + .prop = "rohm,vbus-input-current-limit-microamp", + .range = &input_current_limit_ranges[0], + .ranges = 1, + .data = &init->ibus_lim_set, + }, { + .prop = "rohm,vcc-input-current-limit-microamp", + .range = &input_current_limit_ranges[0], + .ranges = 1, + .data = &init->icc_lim_set, + }, + }; + + /* + * The power_supply_get_battery_info() does not support getting values + * from ACPI. Let's fix it if ACPI is required here. + */ + ret = power_supply_get_battery_info(bd->charger, &info); + if (ret < 0) + return ret; + + /* Put pointers to the generic battery info */ + battery_inits[0].info_data = &info->tricklecharge_current_ua; + battery_inits[1].info_data = &info->precharge_current_ua; + battery_inits[2].info_data = &info->precharge_voltage_max_uv; + battery_inits[3].info_data = &info->charge_term_current_ua; + battery_inits[4].info_data = &info->charge_restart_voltage_uv; + battery_inits[5].info_data = &info->overvoltage_limit_uv; + battery_inits[6].info_data = &info->constant_charge_current_max_ua; + battery_inits[7].info_data = &info->constant_charge_voltage_max_uv; + + for (i = 0; i < ARRAY_SIZE(battery_inits); i++) { + int val = *battery_inits[i].info_data; + const struct linear_range *range = battery_inits[i].range; + int ranges = battery_inits[i].ranges; + + if (val == -EINVAL) + continue; + + ret = linear_range_get_selector_low_array(range, ranges, val, + ®val, &found); + if (ret) { + dev_err(bd->dev, "Unsupported value for %s\n", + battery_inits[i].name); + + power_supply_put_battery_info(bd->charger, info); + return -EINVAL; + } + if (!found) { + dev_warn(bd->dev, + "Unsupported value for %s - using smaller\n", + battery_inits[i].name); + } + *(battery_inits[i].data) = regval; + } + + power_supply_put_battery_info(bd->charger, info); + + for (i = 0; i < ARRAY_SIZE(props); i++) { + ret = device_property_read_u32(bd->dev, props[i].prop, + &property); + if (ret < 0) { + dev_err(bd->dev, "failed to read %s", props[i].prop); + + return ret; + } + + ret = linear_range_get_selector_low_array(props[i].range, + props[i].ranges, + property, ®val, + &found); + if (ret) { + dev_err(bd->dev, "Unsupported value for '%s'\n", + props[i].prop); + + return -EINVAL; + } + + if (!found) { + dev_warn(bd->dev, + "Unsupported value for '%s' - using smaller\n", + props[i].prop); + } + + *(props[i].data) = regval; + } + + return 0; +} + +static void bd9995x_chip_reset(void *bd) +{ + __bd9995x_chip_reset(bd); +} + +static int bd9995x_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct bd9995x_device *bd; + struct power_supply_config psy_cfg = {}; + int ret; + int i; + + bd = devm_kzalloc(dev, sizeof(*bd), GFP_KERNEL); + if (!bd) + return -ENOMEM; + + bd->client = client; + bd->dev = dev; + psy_cfg.drv_data = bd; + psy_cfg.of_node = dev->of_node; + + mutex_init(&bd->lock); + + bd->rmap = devm_regmap_init_i2c(client, &bd9995x_regmap_config); + if (IS_ERR(bd->rmap)) { + dev_err(dev, "Failed to setup register access via i2c\n"); + return PTR_ERR(bd->rmap); + } + + for (i = 0; i < ARRAY_SIZE(bd9995x_reg_fields); i++) { + const struct reg_field *reg_fields = bd9995x_reg_fields; + + bd->rmap_fields[i] = devm_regmap_field_alloc(dev, bd->rmap, + reg_fields[i]); + if (IS_ERR(bd->rmap_fields[i])) { + dev_err(dev, "cannot allocate regmap field\n"); + return PTR_ERR(bd->rmap_fields[i]); + } + } + + i2c_set_clientdata(client, bd); + + ret = regmap_field_read(bd->rmap_fields[F_CHIP_ID], &bd->chip_id); + if (ret) { + dev_err(dev, "Cannot read chip ID.\n"); + return ret; + } + + if (bd->chip_id != BD99954_ID) { + dev_err(dev, "Chip with ID=0x%x, not supported!\n", + bd->chip_id); + return -ENODEV; + } + + ret = regmap_field_read(bd->rmap_fields[F_CHIP_REV], &bd->chip_rev); + if (ret) { + dev_err(dev, "Cannot read revision.\n"); + return ret; + } + + dev_info(bd->dev, "Found BD99954 chip rev %d\n", bd->chip_rev); + + /* + * We need to init the psy before we can call + * power_supply_get_battery_info() for it + */ + bd->charger = devm_power_supply_register(bd->dev, + &bd9995x_power_supply_desc, + &psy_cfg); + if (IS_ERR(bd->charger)) { + dev_err(dev, "Failed to register power supply\n"); + return PTR_ERR(bd->charger); + } + + ret = bd9995x_fw_probe(bd); + if (ret < 0) { + dev_err(dev, "Cannot read device properties.\n"); + return ret; + } + + ret = bd9995x_hw_init(bd); + if (ret < 0) { + dev_err(dev, "Cannot initialize the chip.\n"); + return ret; + } + + ret = devm_add_action_or_reset(dev, bd9995x_chip_reset, bd); + if (ret) + return ret; + + return devm_request_threaded_irq(dev, client->irq, NULL, + bd9995x_irq_handler_thread, + IRQF_TRIGGER_LOW | IRQF_ONESHOT, + BD9995X_IRQ_PIN, bd); +} + +static const struct of_device_id bd9995x_of_match[] = { + { .compatible = "rohm,bd99954", }, + { } +}; +MODULE_DEVICE_TABLE(of, bd9995x_of_match); + +static struct i2c_driver bd9995x_driver = { + .driver = { + .name = "bd9995x-charger", + .of_match_table = bd9995x_of_match, + }, + .probe_new = bd9995x_probe, +}; +module_i2c_driver(bd9995x_driver); + +MODULE_AUTHOR("Laine Markus <markus.laine@fi.rohmeurope.com>"); +MODULE_DESCRIPTION("ROHM BD99954 charger driver"); +MODULE_LICENSE("GPL"); |