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path: root/drivers/power/supply/bd99954-charger.c
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Diffstat (limited to 'drivers/power/supply/bd99954-charger.c')
-rw-r--r--drivers/power/supply/bd99954-charger.c1144
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,
+ &regval, &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, &regval,
+ &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");