Re: [PATCH 2/2] power_supply: Add support for TI BQ25890 charger chip
From: Pavel Machek
Date: Tue Jun 23 2015 - 12:54:17 EST
Should this link....
> More details about the chip can be found here:
> http://www.ti.com/product/bq25890
> @@ -0,0 +1,998 @@
> +/*
> + * TI BQ25890 charger driver
> + *
> + * Copyright (C) 2015 Intel Corporation
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + */
Go here?
Pavel
> +
> +#include <linux/module.h>
> +#include <linux/i2c.h>
> +#include <linux/power_supply.h>
> +#include <linux/regmap.h>
> +#include <linux/types.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/interrupt.h>
> +#include <linux/delay.h>
> +#include <linux/usb/phy.h>
> +
> +#include <linux/acpi.h>
> +#include <linux/of.h>
> +
> +#define BQ25890_MANUFACTURER "Texas Instruments"
> +#define BQ25890_IRQ_PIN "bq25890_irq"
> +
> +#define BQ25890_ID 3
> +
> +enum bq25890_fields {
> + F_EN_HIZ, F_EN_ILIM, F_IILIM, /* Reg00 */
> + F_BHOT, F_BCOLD, F_VINDPM_OFS, /* Reg01 */
> + F_CONV_START, F_CONV_RATE, F_BOOSTF, F_ICO_EN,
> + F_HVDCP_EN, F_MAXC_EN, F_FORCE_DPM, F_AUTO_DPDM_EN, /* Reg02 */
> + F_BAT_LOAD_EN, F_WD_RST, F_OTG_CFG, F_CHG_CFG, F_SYSVMIN, /* Reg03 */
> + F_PUMPX_EN, F_ICHG, /* Reg04 */
> + F_IPRECHG, F_ITERM, /* Reg05 */
> + F_VREG, F_BATLOWV, F_VRECHG, /* Reg06 */
> + F_TERM_EN, F_STAT_DIS, F_WD, F_TMR_EN, F_CHG_TMR,
> + F_JEITA_ISET, /* Reg07 */
> + F_BATCMP, F_VCLAMP, F_TREG, /* Reg08 */
> + F_FORCE_ICO, F_TMR2X_EN, F_BATFET_DIS, F_JEITA_VSET,
> + F_BATFET_DLY, F_BATFET_RST_EN, F_PUMPX_UP, F_PUMPX_DN, /* Reg09 */
> + F_BOOSTV, F_BOOSTI, /* Reg0A */
> + F_VBUS_STAT, F_CHG_STAT, F_PG_STAT, F_SDP_STAT, F_VSYS_STAT, /* Reg0B */
> + F_WD_FAULT, F_BOOST_FAULT, F_CHG_FAULT, F_BAT_FAULT,
> + F_NTC_FAULT, /* Reg0C */
> + F_FORCE_VINDPM, F_VINDPM, /* Reg0D */
> + F_THERM_STAT, F_BATV, /* Reg0E */
> + F_SYSV, /* Reg0F */
> + F_TSPCT, /* Reg10 */
> + F_VBUS_GD, F_VBUSV, /* Reg11 */
> + F_ICHGR, /* Reg12 */
> + F_VDPM_STAT, F_IDPM_STAT, F_IDPM_LIM, /* Reg13 */
> + F_REG_RST, F_ICO_OPTIMIZED, F_PN, F_TS_PROFILE, F_DEV_REV, /* Reg14 */
> +
> + F_MAX_FIELDS
> +};
> +
> +/* initial field values, converted to register values */
> +struct bq25890_init_data {
> + u8 ichg; /* charge current */
> + u8 vreg; /* regulation voltage */
> + u8 iterm; /* termination current */
> + u8 iprechg; /* precharge current */
> + u8 sysvmin; /* minimum system voltage limit */
> + u8 boostv; /* boost regulation voltage */
> + u8 boosti; /* boost current limit */
> + u8 boostf; /* boost frequency */
> + u8 ilim_en; /* enable ILIM pin */
> + u8 treg; /* thermal regulation threshold */
> +};
> +
> +struct bq25890_state {
> + u8 online;
> + u8 chrg_status;
> + u8 chrg_fault;
> + u8 vsys_status;
> + u8 boost_fault;
> + u8 bat_fault;
> +};
> +
> +struct bq25890_device {
> + struct i2c_client *client;
> + struct device *dev;
> + struct power_supply *charger;
> +
> + struct usb_phy *usb_phy;
> + struct notifier_block usb_nb;
> + struct work_struct usb_work;
> + unsigned long usb_event;
> +
> + struct regmap *rmap;
> + struct regmap_field *rmap_fields[F_MAX_FIELDS];
> +
> + u8 chip_id;
> + struct bq25890_init_data init_data;
> + struct bq25890_state state;
> +
> + struct mutex lock; /* protect state data */
> +};
> +
> +static const struct regmap_range bq25890_readonly_reg_ranges[] = {
> + regmap_reg_range(0x0b, 0x0c),
> + regmap_reg_range(0x0e, 0x13),
> +};
> +
> +static const struct regmap_access_table bq25890_writeable_regs = {
> + .no_ranges = bq25890_readonly_reg_ranges,
> + .n_no_ranges = ARRAY_SIZE(bq25890_readonly_reg_ranges),
> +};
> +
> +static const struct regmap_range bq25890_volatile_reg_ranges[] = {
> + regmap_reg_range(0x00, 0x00),
> + regmap_reg_range(0x09, 0x09),
> + regmap_reg_range(0x0b, 0x0c),
> + regmap_reg_range(0x0e, 0x14),
> +};
> +
> +static const struct regmap_access_table bq25890_volatile_regs = {
> + .yes_ranges = bq25890_volatile_reg_ranges,
> + .n_yes_ranges = ARRAY_SIZE(bq25890_volatile_reg_ranges),
> +};
> +
> +static const struct regmap_config bq25890_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> +
> + .max_register = 0x14,
> + .cache_type = REGCACHE_RBTREE,
> +
> + .wr_table = &bq25890_writeable_regs,
> + .volatile_table = &bq25890_volatile_regs,
> +};
> +
> +static const struct reg_field bq25890_reg_fields[] = {
> + /* REG00 */
> + [F_EN_HIZ] = REG_FIELD(0x00, 7, 7),
> + [F_EN_ILIM] = REG_FIELD(0x00, 6, 6),
> + [F_IILIM] = REG_FIELD(0x00, 0, 5),
> + /* REG01 */
> + [F_BHOT] = REG_FIELD(0x01, 6, 7),
> + [F_BCOLD] = REG_FIELD(0x01, 5, 5),
> + [F_VINDPM_OFS] = REG_FIELD(0x01, 0, 4),
> + /* REG02 */
> + [F_CONV_START] = REG_FIELD(0x02, 7, 7),
> + [F_CONV_RATE] = REG_FIELD(0x02, 6, 6),
> + [F_BOOSTF] = REG_FIELD(0x02, 5, 5),
> + [F_ICO_EN] = REG_FIELD(0x02, 4, 4),
> + [F_HVDCP_EN] = REG_FIELD(0x02, 3, 3),
> + [F_MAXC_EN] = REG_FIELD(0x02, 2, 2),
> + [F_FORCE_DPM] = REG_FIELD(0x02, 1, 1),
> + [F_AUTO_DPDM_EN] = REG_FIELD(0x02, 0, 0),
> + /* REG03 */
> + [F_BAT_LOAD_EN] = REG_FIELD(0x03, 7, 7),
> + [F_WD_RST] = REG_FIELD(0x03, 6, 6),
> + [F_OTG_CFG] = REG_FIELD(0x03, 5, 5),
> + [F_CHG_CFG] = REG_FIELD(0x03, 4, 4),
> + [F_SYSVMIN] = REG_FIELD(0x03, 1, 3),
> + /* REG04 */
> + [F_PUMPX_EN] = REG_FIELD(0x04, 7, 7),
> + [F_ICHG] = REG_FIELD(0x04, 0, 6),
> + /* REG05 */
> + [F_IPRECHG] = REG_FIELD(0x05, 4, 7),
> + [F_ITERM] = REG_FIELD(0x05, 0, 3),
> + /* REG06 */
> + [F_VREG] = REG_FIELD(0x06, 2, 7),
> + [F_BATLOWV] = REG_FIELD(0x06, 1, 1),
> + [F_VRECHG] = REG_FIELD(0x06, 0, 0),
> + /* REG07 */
> + [F_TERM_EN] = REG_FIELD(0x07, 7, 7),
> + [F_STAT_DIS] = REG_FIELD(0x07, 6, 6),
> + [F_WD] = REG_FIELD(0x07, 4, 5),
> + [F_TMR_EN] = REG_FIELD(0x07, 3, 3),
> + [F_CHG_TMR] = REG_FIELD(0x07, 1, 2),
> + [F_JEITA_ISET] = REG_FIELD(0x07, 0, 0),
> + /* REG08 */
> + [F_BATCMP] = REG_FIELD(0x08, 6, 7),
> + [F_VCLAMP] = REG_FIELD(0x08, 2, 4),
> + [F_TREG] = REG_FIELD(0x08, 0, 1),
> + /* REG09 */
> + [F_FORCE_ICO] = REG_FIELD(0x09, 7, 7),
> + [F_TMR2X_EN] = REG_FIELD(0x09, 6, 6),
> + [F_BATFET_DIS] = REG_FIELD(0x09, 5, 5),
> + [F_JEITA_VSET] = REG_FIELD(0x09, 4, 4),
> + [F_BATFET_DLY] = REG_FIELD(0x09, 3, 3),
> + [F_BATFET_RST_EN] = REG_FIELD(0x09, 2, 2),
> + [F_PUMPX_UP] = REG_FIELD(0x09, 1, 1),
> + [F_PUMPX_DN] = REG_FIELD(0x09, 0, 0),
> + /* REG0A */
> + [F_BOOSTV] = REG_FIELD(0x0A, 4, 7),
> + [F_BOOSTI] = REG_FIELD(0x0A, 0, 2),
> + /* REG0B */
> + [F_VBUS_STAT] = REG_FIELD(0x0B, 5, 7),
> + [F_CHG_STAT] = REG_FIELD(0x0B, 3, 4),
> + [F_PG_STAT] = REG_FIELD(0x0B, 2, 2),
> + [F_SDP_STAT] = REG_FIELD(0x0B, 1, 1),
> + [F_VSYS_STAT] = REG_FIELD(0x0B, 0, 0),
> + /* REG0C */
> + [F_WD_FAULT] = REG_FIELD(0x0C, 7, 7),
> + [F_BOOST_FAULT] = REG_FIELD(0x0C, 6, 6),
> + [F_CHG_FAULT] = REG_FIELD(0x0C, 4, 5),
> + [F_BAT_FAULT] = REG_FIELD(0x0C, 3, 3),
> + [F_NTC_FAULT] = REG_FIELD(0x0C, 0, 2),
> + /* REG0D */
> + [F_FORCE_VINDPM] = REG_FIELD(0x0D, 7, 7),
> + [F_VINDPM] = REG_FIELD(0x0D, 0, 6),
> + /* REG0E */
> + [F_THERM_STAT] = REG_FIELD(0x0E, 7, 7),
> + [F_BATV] = REG_FIELD(0x0E, 0, 6),
> + /* REG0F */
> + [F_SYSV] = REG_FIELD(0x0F, 0, 6),
> + /* REG10 */
> + [F_TSPCT] = REG_FIELD(0x10, 0, 6),
> + /* REG11 */
> + [F_VBUS_GD] = REG_FIELD(0x11, 7, 7),
> + [F_VBUSV] = REG_FIELD(0x11, 0, 6),
> + /* REG12 */
> + [F_ICHGR] = REG_FIELD(0x12, 0, 6),
> + /* REG13 */
> + [F_VDPM_STAT] = REG_FIELD(0x13, 7, 7),
> + [F_IDPM_STAT] = REG_FIELD(0x13, 6, 6),
> + [F_IDPM_LIM] = REG_FIELD(0x13, 0, 5),
> + /* REG14 */
> + [F_REG_RST] = REG_FIELD(0x14, 7, 7),
> + [F_ICO_OPTIMIZED] = REG_FIELD(0x14, 6, 6),
> + [F_PN] = REG_FIELD(0x14, 3, 5),
> + [F_TS_PROFILE] = REG_FIELD(0x14, 2, 2),
> + [F_DEV_REV] = REG_FIELD(0x14, 0, 1)
> +};
> +
> +/*
> + * Most of the val -> idx conversions can be computed, given the minimum,
> + * maximum and the step between values. For the rest of conversions, we use
> + * lookup tables.
> + */
> +enum bq25890_table_ids {
> + /* range tables */
> + TBL_ICHG,
> + TBL_ITERM,
> + TBL_IPRECHG,
> + TBL_VREG,
> + TBL_BATCMP,
> + TBL_VCLAMP,
> + TBL_BOOSTV,
> + TBL_SYSVMIN,
> +
> + /* lookup tables */
> + TBL_TREG,
> + TBL_BOOSTI,
> +};
> +
> +/* Thermal Regulation Threshold lookup table, in degrees Celsius */
> +static const u32 bq25890_treg_tbl[] = { 60, 80, 100, 120 };
> +
> +#define BQ25890_TREG_TBL_SIZE ARRAY_SIZE(bq25890_treg_tbl)
> +
> +/* Boost mode current limit lookup table, in uA */
> +static const u32 bq25890_boosti_tbl[] = {
> + 500000, 700000, 1100000, 1300000, 1600000, 1800000, 2100000, 2400000
> +};
> +
> +#define BQ25890_BOOSTI_TBL_SIZE ARRAY_SIZE(bq25890_boosti_tbl)
> +
> +struct bq25890_range {
> + u32 min;
> + u32 max;
> + u32 step;
> +};
> +
> +struct bq25890_lookup {
> + const u32 *tbl;
> + u32 size;
> +};
> +
> +static const union {
> + struct bq25890_range rt;
> + struct bq25890_lookup lt;
> +} bq25890_tables[] = {
> + /* range tables */
> + [TBL_ICHG] = { .rt = {0, 5056000, 64000} }, /* uA */
> + [TBL_ITERM] = { .rt = {64000, 1024000, 64000} }, /* uA */
> + [TBL_VREG] = { .rt = {3840000, 4608000, 16000} }, /* uV */
> + [TBL_BATCMP] = { .rt = {0, 140, 20} }, /* mOhm */
> + [TBL_VCLAMP] = { .rt = {0, 224000, 32000} }, /* uV */
> + [TBL_BOOSTV] = { .rt = {4550000, 5510000, 64000} }, /* uV */
> + [TBL_SYSVMIN] = { .rt = {3000000, 3700000, 100000} }, /* uV */
> +
> + /* lookup tables */
> + [TBL_TREG] = { .lt = {bq25890_treg_tbl, BQ25890_TREG_TBL_SIZE} },
> + [TBL_BOOSTI] = { .lt = {bq25890_boosti_tbl, BQ25890_BOOSTI_TBL_SIZE} }
> +};
> +
> +static int bq25890_field_read(struct bq25890_device *bq,
> + enum bq25890_fields field_id)
> +{
> + int ret;
> + int val;
> +
> + ret = regmap_field_read(bq->rmap_fields[field_id], &val);
> + if (ret < 0)
> + return ret;
> +
> + return val;
> +}
> +
> +static int bq25890_field_write(struct bq25890_device *bq,
> + enum bq25890_fields field_id, u8 val)
> +{
> + return regmap_field_write(bq->rmap_fields[field_id], val);
> +}
> +
> +static u8 bq25890_find_idx(u32 value, enum bq25890_table_ids id)
> +{
> + u8 idx;
> +
> + if (id >= TBL_TREG) {
> + const u32 *tbl = bq25890_tables[id].lt.tbl;
> + u32 tbl_size = bq25890_tables[id].lt.size;
> +
> + for (idx = 1; idx < tbl_size && tbl[idx] <= value; idx++)
> + ;
> + } else {
> + const struct bq25890_range *rtbl = &bq25890_tables[id].rt;
> + u8 rtbl_size;
> +
> + rtbl_size = (rtbl->max - rtbl->min) / rtbl->step + 1;
> +
> + for (idx = 1;
> + idx < rtbl_size && idx * rtbl->step + rtbl->min <= value;
> + idx++)
> + ;
> + }
> +
> + return idx - 1;
> +}
> +
> +static u32 bq25890_find_val(u8 idx, enum bq25890_table_ids id)
> +{
> + const struct bq25890_range *rtbl;
> +
> + /* lookup table? */
> + if (id >= TBL_TREG)
> + return bq25890_tables[id].lt.tbl[idx];
> +
> + /* range table */
> + rtbl = &bq25890_tables[id].rt;
> +
> + return(rtbl->min + idx * rtbl->step);
> +}
> +
> +enum bq25890_status {
> + STATUS_NOT_CHARGING,
> + STATUS_PRE_CHARGING,
> + STATUS_FAST_CHARGING,
> + STATUS_TERMINATION_DONE,
> +};
> +
> +enum bq25890_chrg_fault {
> + CHRG_FAULT_NORMAL,
> + CHRG_FAULT_INPUT,
> + CHRG_FAULT_THERMAL_SHUTDOWN,
> + CHRG_FAULT_TIMER_EXPIRED,
> +};
> +
> +static int bq25890_power_supply_get_property(struct power_supply *psy,
> + enum power_supply_property psp,
> + union power_supply_propval *val)
> +{
> + int ret;
> + struct bq25890_device *bq = power_supply_get_drvdata(psy);
> + struct bq25890_state state;
> +
> + mutex_lock(&bq->lock);
> + state = bq->state;
> + mutex_unlock(&bq->lock);
> +
> + switch (psp) {
> + case POWER_SUPPLY_PROP_STATUS:
> + if (!state.online)
> + val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
> + else if (state.chrg_status == STATUS_NOT_CHARGING)
> + val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
> + else if (state.chrg_status == STATUS_PRE_CHARGING ||
> + state.chrg_status == STATUS_FAST_CHARGING)
> + val->intval = POWER_SUPPLY_STATUS_CHARGING;
> + else if (state.chrg_status == STATUS_TERMINATION_DONE)
> + val->intval = POWER_SUPPLY_STATUS_FULL;
> + else
> + val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
> +
> + break;
> +
> + case POWER_SUPPLY_PROP_MANUFACTURER:
> + val->strval = BQ25890_MANUFACTURER;
> + break;
> +
> + case POWER_SUPPLY_PROP_ONLINE:
> + val->intval = state.online;
> + break;
> +
> + case POWER_SUPPLY_PROP_HEALTH:
> + if (!state.chrg_fault && !state.bat_fault && !state.boost_fault)
> + val->intval = POWER_SUPPLY_HEALTH_GOOD;
> + else if (state.bat_fault)
> + val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
> + else if (state.chrg_fault == CHRG_FAULT_TIMER_EXPIRED)
> + val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
> + else if (state.chrg_fault == CHRG_FAULT_THERMAL_SHUTDOWN)
> + val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
> + else
> + val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
> + break;
> +
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
> + ret = bq25890_field_read(bq, F_ICHGR); /* read measured value */
> + if (ret < 0)
> + return ret;
> +
> + /* converted_val = ADC_val * 50mA (table 10.3.19) */
> + val->intval = ret * 50000;
> + break;
> +
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
> + val->intval = bq25890_tables[TBL_ICHG].rt.max;
> + break;
> +
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
> + if (!state.online) {
> + val->intval = 0;
> + break;
> + }
> +
> + ret = bq25890_field_read(bq, F_BATV); /* read measured value */
> + if (ret < 0)
> + return ret;
> +
> + /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */
> + val->intval = 2304000 + ret * 20000;
> + break;
> +
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
> + val->intval = bq25890_tables[TBL_VREG].rt.max;
> + break;
> +
> + case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
> + val->intval = bq25890_find_val(bq->init_data.iterm, TBL_ITERM);
> + break;
> +
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static int bq25890_get_chip_state(struct bq25890_device *bq,
> + struct bq25890_state *state)
> +{
> + int i, ret;
> +
> + struct {
> + enum bq25890_fields id;
> + u8 *data;
> + } state_fields[] = {
> + {F_CHG_STAT, &state->chrg_status},
> + {F_PG_STAT, &state->online},
> + {F_VSYS_STAT, &state->vsys_status},
> + {F_BOOST_FAULT, &state->boost_fault},
> + {F_BAT_FAULT, &state->bat_fault},
> + {F_CHG_FAULT, &state->chrg_fault}
> + };
> +
> + for (i = 0; i < ARRAY_SIZE(state_fields); i++) {
> + ret = bq25890_field_read(bq, state_fields[i].id);
> + if (ret < 0)
> + return ret;
> +
> + *state_fields[i].data = ret;
> + }
> +
> + dev_dbg(bq->dev, "S:CHG/PG/VSYS=%d/%d/%d, F:CHG/BOOST/BAT=%d/%d/%d\n",
> + state->chrg_status, state->online, state->vsys_status,
> + state->chrg_fault, state->boost_fault, state->bat_fault);
> +
> + return 0;
> +}
> +
> +static bool bq25890_state_changed(struct bq25890_device *bq,
> + struct bq25890_state *new_state)
> +{
> + struct bq25890_state old_state;
> +
> + mutex_lock(&bq->lock);
> + old_state = bq->state;
> + mutex_unlock(&bq->lock);
> +
> + return (old_state.chrg_status != new_state->chrg_status ||
> + old_state.chrg_fault != new_state->chrg_fault ||
> + old_state.online != new_state->online ||
> + old_state.bat_fault != new_state->bat_fault ||
> + old_state.boost_fault != new_state->boost_fault ||
> + old_state.vsys_status != new_state->vsys_status);
> +}
> +
> +static void bq25890_handle_state_change(struct bq25890_device *bq,
> + struct bq25890_state *new_state)
> +{
> + int ret;
> + struct bq25890_state old_state;
> +
> + mutex_lock(&bq->lock);
> + old_state = bq->state;
> + mutex_unlock(&bq->lock);
> +
> + if (!new_state->online) { /* power removed */
> + /* disable ADC */
> + ret = bq25890_field_write(bq, F_CONV_START, 0);
> + if (ret < 0)
> + goto error;
> + } else if (!old_state.online) { /* power inserted */
> + /* enable ADC, to have control of charge current/voltage */
> + ret = bq25890_field_write(bq, F_CONV_START, 1);
> + if (ret < 0)
> + goto error;
> + }
> +
> + return;
> +
> +error:
> + dev_err(bq->dev, "%s: Error communicating with the chip.\n", __func__);
> +}
> +
> +static irqreturn_t bq25890_irq_handler_thread(int irq, void *private)
> +{
> + struct bq25890_device *bq = private;
> + int ret;
> + struct bq25890_state state;
> +
> + ret = bq25890_get_chip_state(bq, &state);
> + if (ret < 0)
> + goto handled;
> +
> + if (!bq25890_state_changed(bq, &state))
> + goto handled;
> +
> + bq25890_handle_state_change(bq, &state);
> +
> + mutex_lock(&bq->lock);
> + bq->state = state;
> + mutex_unlock(&bq->lock);
> +
> + power_supply_changed(bq->charger);
> +
> +handled:
> + return IRQ_HANDLED;
> +}
> +
> +static int bq25890_chip_reset(struct bq25890_device *bq)
> +{
> + int ret;
> +
> + ret = bq25890_field_write(bq, F_REG_RST, 1);
> + if (ret < 0)
> + return ret;
> +
> + do {
> + ret = bq25890_field_read(bq, F_REG_RST);
> + if (ret < 0)
> + return ret;
> +
> + usleep_range(5, 10);
> + } while (ret == 1);
> +
> + return 0;
> +}
> +
> +static int bq25890_hw_init(struct bq25890_device *bq)
> +{
> + int ret;
> + int i;
> + struct bq25890_state state;
> +
> + const struct {
> + enum bq25890_fields id;
> + u32 value;
> + } init_data[] = {
> + {F_ICHG, bq->init_data.ichg},
> + {F_VREG, bq->init_data.vreg},
> + {F_ITERM, bq->init_data.iterm},
> + {F_IPRECHG, bq->init_data.iprechg},
> + {F_SYSVMIN, bq->init_data.sysvmin},
> + {F_BOOSTV, bq->init_data.boostv},
> + {F_BOOSTI, bq->init_data.boosti},
> + {F_BOOSTF, bq->init_data.boostf},
> + {F_EN_ILIM, bq->init_data.ilim_en},
> + {F_TREG, bq->init_data.treg}
> + };
> +
> + ret = bq25890_chip_reset(bq);
> + if (ret < 0)
> + return ret;
> +
> + /* disable watchdog */
> + ret = bq25890_field_write(bq, F_WD, 0);
> + if (ret < 0)
> + return ret;
> +
> + /* initialize currents/voltages and other parameters */
> + for (i = 0; i < ARRAY_SIZE(init_data); i++) {
> + ret = bq25890_field_write(bq, init_data[i].id,
> + init_data[i].value);
> + if (ret < 0)
> + return ret;
> + }
> +
> + /* Configure ADC for continuous conversions. This does not enable it. */
> + ret = bq25890_field_write(bq, F_CONV_RATE, 1);
> + if (ret < 0)
> + return ret;
> +
> + ret = bq25890_get_chip_state(bq, &state);
> + if (ret < 0)
> + return ret;
> +
> + mutex_lock(&bq->lock);
> + bq->state = state;
> + mutex_unlock(&bq->lock);
> +
> + return 0;
> +}
> +
> +static enum power_supply_property bq25890_power_supply_props[] = {
> + POWER_SUPPLY_PROP_MANUFACTURER,
> + POWER_SUPPLY_PROP_STATUS,
> + POWER_SUPPLY_PROP_ONLINE,
> + POWER_SUPPLY_PROP_HEALTH,
> + POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
> + POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
> + POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
> + POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
> + POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
> +};
> +
> +static char *bq25890_charger_supplied_to[] = {
> + "main-battery",
> +};
> +
> +static const struct power_supply_desc bq25890_power_supply_desc = {
> + .name = "bq25890-charger",
> + .type = POWER_SUPPLY_TYPE_USB,
> + .properties = bq25890_power_supply_props,
> + .num_properties = ARRAY_SIZE(bq25890_power_supply_props),
> + .get_property = bq25890_power_supply_get_property,
> +};
> +
> +static int bq25890_power_supply_init(struct bq25890_device *bq)
> +{
> + struct power_supply_config psy_cfg = { .drv_data = bq, };
> +
> + psy_cfg.supplied_to = bq25890_charger_supplied_to;
> + psy_cfg.num_supplicants = ARRAY_SIZE(bq25890_charger_supplied_to);
> +
> + bq->charger = power_supply_register(bq->dev, &bq25890_power_supply_desc,
> + &psy_cfg);
> + if (IS_ERR(bq->charger))
> + return PTR_ERR(bq->charger);
> +
> + return 0;
> +}
> +
> +static void bq25890_usb_work(struct work_struct *data)
> +{
> + int ret;
> + struct bq25890_device *bq =
> + container_of(data, struct bq25890_device, usb_work);
> +
> + switch (bq->usb_event) {
> + case USB_EVENT_ID:
> + /* Enable boost mode */
> + ret = bq25890_field_write(bq, F_OTG_CFG, 1);
> + if (ret < 0)
> + goto error;
> + break;
> +
> + case USB_EVENT_NONE:
> + /* Disable boost mode */
> + ret = bq25890_field_write(bq, F_OTG_CFG, 0);
> + if (ret < 0)
> + goto error;
> +
> + power_supply_changed(bq->charger);
> + break;
> + }
> +
> + return;
> +
> +error:
> + dev_err(bq->dev, "%s - Error switching to boost/charger mode.\n",
> + __func__);
> +}
> +
> +static int bq25890_usb_notifier(struct notifier_block *nb, unsigned long val,
> + void *priv)
> +{
> + struct bq25890_device *bq =
> + container_of(nb, struct bq25890_device, usb_nb);
> +
> + bq->usb_event = val;
> + schedule_work(&bq->usb_work);
> +
> + return NOTIFY_OK;
> +}
> +
> +static int bq25890_irq_probe(struct bq25890_device *bq)
> +{
> + int ret;
> + struct gpio_desc *irq;
> +
> + irq = devm_gpiod_get_index(bq->dev, BQ25890_IRQ_PIN, 0);
> + if (IS_ERR(irq)) {
> + dev_err(bq->dev, "could not probe irq pin\n");
> + return PTR_ERR(irq);
> + }
> +
> + ret = gpiod_direction_input(irq);
> + if (ret < 0)
> + return ret;
> +
> + return gpiod_to_irq(irq);
> +}
> +
> +static int bq25890_fw_read_u32_props(struct bq25890_device *bq)
> +{
> + int ret;
> + u32 property;
> + int i;
> + struct bq25890_init_data *init = &bq->init_data;
> + struct {
> + char *name;
> + bool optional;
> + enum bq25890_table_ids tbl_id;
> + u8 *conv_data; /* holds converted value from given property */
> + } props[] = {
> + /* required properties */
> + {"ti,charge-current", false, TBL_ICHG, &init->ichg},
> + {"ti,battery-regulation-voltage", false, TBL_VREG, &init->vreg},
> + {"ti,termination-current", false, TBL_ITERM, &init->iterm},
> + {"ti,precharge-current", false, TBL_ITERM, &init->iprechg},
> + {"ti,minimum-sys-voltage", false, TBL_SYSVMIN, &init->sysvmin},
> + {"ti,boost-voltage", false, TBL_BOOSTV, &init->boostv},
> + {"ti,boost-max-current", false, TBL_BOOSTI, &init->boosti},
> +
> + /* optional properties */
> + {"ti,thermal-regulation-threshold", true, TBL_TREG, &init->treg}
> + };
> +
> + /* initialize data for optional properties */
> + init->treg = 3; /* 120 degrees Celsius */
> +
> + for (i = 0; i < ARRAY_SIZE(props); i++) {
> + ret = device_property_read_u32(bq->dev, props[i].name,
> + &property);
> + if (ret < 0) {
> + if (props[i].optional)
> + continue;
> +
> + return ret;
> + }
> +
> + *props[i].conv_data = bq25890_find_idx(property,
> + props[i].tbl_id);
> + }
> +
> + return 0;
> +}
> +
> +static int bq25890_fw_probe(struct bq25890_device *bq)
> +{
> + int ret;
> + struct bq25890_init_data *init = &bq->init_data;
> +
> + ret = bq25890_fw_read_u32_props(bq);
> + if (ret < 0)
> + return ret;
> +
> + init->ilim_en = device_property_read_bool(bq->dev, "ti,use-ilim-pin");
> + init->boostf = device_property_read_bool(bq->dev, "ti,boost-low-freq");
> +
> + return 0;
> +}
> +
> +static int bq25890_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
> + struct device *dev = &client->dev;
> + struct bq25890_device *bq;
> + int ret;
> + int i;
> +
> + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
> + dev_err(dev, "No support for SMBUS_BYTE_DATA\n");
> + return -ENODEV;
> + }
> +
> + bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL);
> + if (!bq)
> + return -ENOMEM;
> +
> + bq->client = client;
> + bq->dev = dev;
> +
> + mutex_init(&bq->lock);
> +
> + bq->rmap = devm_regmap_init_i2c(client, &bq25890_regmap_config);
> + if (IS_ERR(bq->rmap)) {
> + dev_err(dev, "failed to allocate register map\n");
> + return PTR_ERR(bq->rmap);
> + }
> +
> + for (i = 0; i < ARRAY_SIZE(bq25890_reg_fields); i++) {
> + const struct reg_field *reg_fields = bq25890_reg_fields;
> +
> + bq->rmap_fields[i] = devm_regmap_field_alloc(dev, bq->rmap,
> + reg_fields[i]);
> + if (IS_ERR(bq->rmap_fields[i])) {
> + dev_err(dev, "cannot allocate regmap field\n");
> + return PTR_ERR(bq->rmap_fields[i]);
> + }
> + }
> +
> + i2c_set_clientdata(client, bq);
> +
> + bq->chip_id = bq25890_field_read(bq, F_PN);
> + if (bq->chip_id < 0) {
> + dev_err(dev, "Cannot read chip ID.\n");
> + return ret;
> + }
> +
> + if (bq->chip_id != BQ25890_ID) {
> + dev_err(dev, "Chip with ID=%d, not supported!\n", bq->chip_id);
> + return -ENODEV;
> + }
> +
> + if (!dev->platform_data) {
> + ret = bq25890_fw_probe(bq);
> + if (ret < 0) {
> + dev_err(dev, "Cannot read device properties.\n");
> + return ret;
> + }
> + } else {
> + return -ENODEV;
> + }
> +
> + ret = bq25890_hw_init(bq);
> + if (ret < 0) {
> + dev_err(dev, "Cannot initialize the chip.\n");
> + return ret;
> + }
> +
> + if (client->irq <= 0)
> + client->irq = bq25890_irq_probe(bq);
> +
> + if (client->irq < 0) {
> + dev_err(dev, "no irq resource found\n");
> + return client->irq;
> + }
> +
> + /* OTG reporting */
> + bq->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
> + if (!IS_ERR_OR_NULL(bq->usb_phy)) {
> + INIT_WORK(&bq->usb_work, bq25890_usb_work);
> + bq->usb_nb.notifier_call = bq25890_usb_notifier;
> + usb_register_notifier(bq->usb_phy, &bq->usb_nb);
> + }
> +
> + ret = devm_request_threaded_irq(dev, client->irq, NULL,
> + bq25890_irq_handler_thread,
> + IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> + BQ25890_IRQ_PIN, bq);
> + if (ret)
> + goto irq_fail;
> +
> + ret = bq25890_power_supply_init(bq);
> + if (ret < 0) {
> + dev_err(dev, "Failed to register power supply\n");
> + goto irq_fail;
> + }
> +
> + return 0;
> +
> +irq_fail:
> + if (!IS_ERR_OR_NULL(bq->usb_phy))
> + usb_unregister_notifier(bq->usb_phy, &bq->usb_nb);
> +
> + return ret;
> +}
> +
> +static int bq25890_remove(struct i2c_client *client)
> +{
> + struct bq25890_device *bq = i2c_get_clientdata(client);
> +
> + if (!IS_ERR_OR_NULL(bq->usb_phy))
> + usb_unregister_notifier(bq->usb_phy, &bq->usb_nb);
> +
> + power_supply_unregister(bq->charger);
> +
> + /* reset all registers to default values */
> + bq25890_chip_reset(bq);
> +
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int bq25890_suspend(struct device *dev)
> +{
> + struct bq25890_device *bq = dev_get_drvdata(dev);
> +
> + /*
> + * If charger is removed, while in suspend, make sure ADC is diabled
> + * since it consumes slightly more power.
> + */
> + return bq25890_field_write(bq, F_CONV_START, 0);
> +}
> +
> +static int bq25890_resume(struct device *dev)
> +{
> + int ret;
> + struct bq25890_state state;
> + struct bq25890_device *bq = dev_get_drvdata(dev);
> +
> + ret = bq25890_get_chip_state(bq, &state);
> + if (ret < 0)
> + return ret;
> +
> + mutex_lock(&bq->lock);
> + bq->state = state;
> + mutex_unlock(&bq->lock);
> +
> + /* Re-enable ADC only if charger is plugged in. */
> + if (bq->state.online) {
> + ret = bq25890_field_write(bq, F_CONV_START, 1);
> + if (ret < 0)
> + return ret;
> + }
> +
> + /* signal userspace, maybe state changed while suspended */
> + power_supply_changed(bq->charger);
> +
> + return 0;
> +}
> +#endif
> +
> +static const struct dev_pm_ops bq25890_pm = {
> + SET_SYSTEM_SLEEP_PM_OPS(bq25890_suspend, bq25890_resume)
> +};
> +
> +static const struct i2c_device_id bq25890_i2c_ids[] = {
> + { "bq25890", 0 },
> + {},
> +};
> +MODULE_DEVICE_TABLE(i2c, bq25890_i2c_ids);
> +
> +static const struct of_device_id bq25890_of_match[] = {
> + { .compatible = "ti,bq25890", },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, bq25890_of_match);
> +
> +static const struct acpi_device_id bq25890_acpi_match[] = {
> + {"BQ258900", 0},
> + {},
> +};
> +MODULE_DEVICE_TABLE(acpi, bq25890_acpi_match);
> +
> +static struct i2c_driver bq25890_driver = {
> + .driver = {
> + .name = "bq25890-charger",
> + .of_match_table = of_match_ptr(bq25890_of_match),
> + .acpi_match_table = ACPI_PTR(bq25890_acpi_match),
> + .pm = &bq25890_pm,
> + },
> + .probe = bq25890_probe,
> + .remove = bq25890_remove,
> + .id_table = bq25890_i2c_ids,
> +};
> +module_i2c_driver(bq25890_driver);
> +
> +MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@xxxxxxxxx>");
> +MODULE_DESCRIPTION("bq25890 charger driver");
> +MODULE_LICENSE("GPL");
> --
> 1.9.1
>
> --
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