| // 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[] = { |
| LINEAR_RANGE(0, 0x0, 0x1ff, 32000), |
| }; |
| |
| /* Possible trickle, pre-charging and termination current values */ |
| static const struct linear_range charging_current_ranges[] = { |
| LINEAR_RANGE(0, 0x0, 0x10, 64000), |
| LINEAR_RANGE(1024000, 0x11, 0x1f, 0), |
| }; |
| |
| /* |
| * 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[] = { |
| LINEAR_RANGE(2560000, 0, 0xA0, 0), |
| LINEAR_RANGE(2560000, 0xA0, 0x4B0, 16000), |
| LINEAR_RANGE(19200000, 0x4B0, 0x7FF, 0), |
| }; |
| |
| /* Possible VSYS voltage regulation values */ |
| static const struct linear_range vsys_voltage_regulation_ranges[] = { |
| LINEAR_RANGE(2560000, 0, 0x28, 0), |
| LINEAR_RANGE(2560000, 0x28, 0x12C, 64000), |
| LINEAR_RANGE(19200000, 0x12C, 0x1FF, 0), |
| }; |
| |
| /* Possible settings for switching from trickle to pre-charging limits */ |
| static const struct linear_range trickle_to_pre_threshold_ranges[] = { |
| LINEAR_RANGE(2048000, 0, 0x20, 0), |
| LINEAR_RANGE(2048000, 0x20, 0x12C, 64000), |
| LINEAR_RANGE(19200000, 0x12C, 0x1FF, 0), |
| }; |
| |
| /* Possible current values for fast-charging constant current phase */ |
| static const struct linear_range fast_charge_current_ranges[] = { |
| LINEAR_RANGE(0, 0, 0xFF, 64000), |
| }; |
| |
| 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"); |