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- /*
- * Summit Microelectronics SMB347 Battery Charger Driver
- *
- * Copyright (C) 2011, Intel Corporation
- *
- * Authors: Bruce E. Robertson <bruce.e.robertson@intel.com>
- * Mika Westerberg <mika.westerberg@linux.intel.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
- #include <linux/err.h>
- #include <linux/gpio.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/interrupt.h>
- #include <linux/i2c.h>
- #include <linux/mutex.h>
- #include <linux/power_supply.h>
- #include <linux/power/smb347-charger.h>
- #include <linux/regmap.h>
- /*
- * Configuration registers. These are mirrored to volatile RAM and can be
- * written once %CMD_A_ALLOW_WRITE is set in %CMD_A register. They will be
- * reloaded from non-volatile registers after POR.
- */
- #define CFG_CHARGE_CURRENT 0x00
- #define CFG_CHARGE_CURRENT_FCC_MASK 0xe0
- #define CFG_CHARGE_CURRENT_FCC_SHIFT 5
- #define CFG_CHARGE_CURRENT_PCC_MASK 0x18
- #define CFG_CHARGE_CURRENT_PCC_SHIFT 3
- #define CFG_CHARGE_CURRENT_TC_MASK 0x07
- #define CFG_CURRENT_LIMIT 0x01
- #define CFG_CURRENT_LIMIT_DC_MASK 0xf0
- #define CFG_CURRENT_LIMIT_DC_SHIFT 4
- #define CFG_CURRENT_LIMIT_USB_MASK 0x0f
- #define CFG_FLOAT_VOLTAGE 0x03
- #define CFG_FLOAT_VOLTAGE_FLOAT_MASK 0x3f
- #define CFG_FLOAT_VOLTAGE_THRESHOLD_MASK 0xc0
- #define CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT 6
- #define CFG_STAT 0x05
- #define CFG_STAT_DISABLED BIT(5)
- #define CFG_STAT_ACTIVE_HIGH BIT(7)
- #define CFG_PIN 0x06
- #define CFG_PIN_EN_CTRL_MASK 0x60
- #define CFG_PIN_EN_CTRL_ACTIVE_HIGH 0x40
- #define CFG_PIN_EN_CTRL_ACTIVE_LOW 0x60
- #define CFG_PIN_EN_APSD_IRQ BIT(1)
- #define CFG_PIN_EN_CHARGER_ERROR BIT(2)
- #define CFG_THERM 0x07
- #define CFG_THERM_SOFT_HOT_COMPENSATION_MASK 0x03
- #define CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT 0
- #define CFG_THERM_SOFT_COLD_COMPENSATION_MASK 0x0c
- #define CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT 2
- #define CFG_THERM_MONITOR_DISABLED BIT(4)
- #define CFG_SYSOK 0x08
- #define CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED BIT(2)
- #define CFG_OTHER 0x09
- #define CFG_OTHER_RID_MASK 0xc0
- #define CFG_OTHER_RID_ENABLED_AUTO_OTG 0xc0
- #define CFG_OTG 0x0a
- #define CFG_OTG_TEMP_THRESHOLD_MASK 0x30
- #define CFG_OTG_TEMP_THRESHOLD_SHIFT 4
- #define CFG_OTG_CC_COMPENSATION_MASK 0xc0
- #define CFG_OTG_CC_COMPENSATION_SHIFT 6
- #define CFG_TEMP_LIMIT 0x0b
- #define CFG_TEMP_LIMIT_SOFT_HOT_MASK 0x03
- #define CFG_TEMP_LIMIT_SOFT_HOT_SHIFT 0
- #define CFG_TEMP_LIMIT_SOFT_COLD_MASK 0x0c
- #define CFG_TEMP_LIMIT_SOFT_COLD_SHIFT 2
- #define CFG_TEMP_LIMIT_HARD_HOT_MASK 0x30
- #define CFG_TEMP_LIMIT_HARD_HOT_SHIFT 4
- #define CFG_TEMP_LIMIT_HARD_COLD_MASK 0xc0
- #define CFG_TEMP_LIMIT_HARD_COLD_SHIFT 6
- #define CFG_FAULT_IRQ 0x0c
- #define CFG_FAULT_IRQ_DCIN_UV BIT(2)
- #define CFG_STATUS_IRQ 0x0d
- #define CFG_STATUS_IRQ_TERMINATION_OR_TAPER BIT(4)
- #define CFG_STATUS_IRQ_CHARGE_TIMEOUT BIT(7)
- #define CFG_ADDRESS 0x0e
- /* Command registers */
- #define CMD_A 0x30
- #define CMD_A_CHG_ENABLED BIT(1)
- #define CMD_A_SUSPEND_ENABLED BIT(2)
- #define CMD_A_ALLOW_WRITE BIT(7)
- #define CMD_B 0x31
- #define CMD_C 0x33
- /* Interrupt Status registers */
- #define IRQSTAT_A 0x35
- #define IRQSTAT_C 0x37
- #define IRQSTAT_C_TERMINATION_STAT BIT(0)
- #define IRQSTAT_C_TERMINATION_IRQ BIT(1)
- #define IRQSTAT_C_TAPER_IRQ BIT(3)
- #define IRQSTAT_D 0x38
- #define IRQSTAT_D_CHARGE_TIMEOUT_STAT BIT(2)
- #define IRQSTAT_D_CHARGE_TIMEOUT_IRQ BIT(3)
- #define IRQSTAT_E 0x39
- #define IRQSTAT_E_USBIN_UV_STAT BIT(0)
- #define IRQSTAT_E_USBIN_UV_IRQ BIT(1)
- #define IRQSTAT_E_DCIN_UV_STAT BIT(4)
- #define IRQSTAT_E_DCIN_UV_IRQ BIT(5)
- #define IRQSTAT_F 0x3a
- /* Status registers */
- #define STAT_A 0x3b
- #define STAT_A_FLOAT_VOLTAGE_MASK 0x3f
- #define STAT_B 0x3c
- #define STAT_C 0x3d
- #define STAT_C_CHG_ENABLED BIT(0)
- #define STAT_C_HOLDOFF_STAT BIT(3)
- #define STAT_C_CHG_MASK 0x06
- #define STAT_C_CHG_SHIFT 1
- #define STAT_C_CHG_TERM BIT(5)
- #define STAT_C_CHARGER_ERROR BIT(6)
- #define STAT_E 0x3f
- #define SMB347_MAX_REGISTER 0x3f
- /**
- * struct smb347_charger - smb347 charger instance
- * @lock: protects concurrent access to online variables
- * @dev: pointer to device
- * @regmap: pointer to driver regmap
- * @mains: power_supply instance for AC/DC power
- * @usb: power_supply instance for USB power
- * @battery: power_supply instance for battery
- * @mains_online: is AC/DC input connected
- * @usb_online: is USB input connected
- * @charging_enabled: is charging enabled
- * @pdata: pointer to platform data
- */
- struct smb347_charger {
- struct mutex lock;
- struct device *dev;
- struct regmap *regmap;
- struct power_supply *mains;
- struct power_supply *usb;
- struct power_supply *battery;
- bool mains_online;
- bool usb_online;
- bool charging_enabled;
- const struct smb347_charger_platform_data *pdata;
- };
- /* Fast charge current in uA */
- static const unsigned int fcc_tbl[] = {
- 700000,
- 900000,
- 1200000,
- 1500000,
- 1800000,
- 2000000,
- 2200000,
- 2500000,
- };
- /* Pre-charge current in uA */
- static const unsigned int pcc_tbl[] = {
- 100000,
- 150000,
- 200000,
- 250000,
- };
- /* Termination current in uA */
- static const unsigned int tc_tbl[] = {
- 37500,
- 50000,
- 100000,
- 150000,
- 200000,
- 250000,
- 500000,
- 600000,
- };
- /* Input current limit in uA */
- static const unsigned int icl_tbl[] = {
- 300000,
- 500000,
- 700000,
- 900000,
- 1200000,
- 1500000,
- 1800000,
- 2000000,
- 2200000,
- 2500000,
- };
- /* Charge current compensation in uA */
- static const unsigned int ccc_tbl[] = {
- 250000,
- 700000,
- 900000,
- 1200000,
- };
- /* Convert register value to current using lookup table */
- static int hw_to_current(const unsigned int *tbl, size_t size, unsigned int val)
- {
- if (val >= size)
- return -EINVAL;
- return tbl[val];
- }
- /* Convert current to register value using lookup table */
- static int current_to_hw(const unsigned int *tbl, size_t size, unsigned int val)
- {
- size_t i;
- for (i = 0; i < size; i++)
- if (val < tbl[i])
- break;
- return i > 0 ? i - 1 : -EINVAL;
- }
- /**
- * smb347_update_ps_status - refreshes the power source status
- * @smb: pointer to smb347 charger instance
- *
- * Function checks whether any power source is connected to the charger and
- * updates internal state accordingly. If there is a change to previous state
- * function returns %1, otherwise %0 and negative errno in case of errror.
- */
- static int smb347_update_ps_status(struct smb347_charger *smb)
- {
- bool usb = false;
- bool dc = false;
- unsigned int val;
- int ret;
- ret = regmap_read(smb->regmap, IRQSTAT_E, &val);
- if (ret < 0)
- return ret;
- /*
- * Dc and usb are set depending on whether they are enabled in
- * platform data _and_ whether corresponding undervoltage is set.
- */
- if (smb->pdata->use_mains)
- dc = !(val & IRQSTAT_E_DCIN_UV_STAT);
- if (smb->pdata->use_usb)
- usb = !(val & IRQSTAT_E_USBIN_UV_STAT);
- mutex_lock(&smb->lock);
- ret = smb->mains_online != dc || smb->usb_online != usb;
- smb->mains_online = dc;
- smb->usb_online = usb;
- mutex_unlock(&smb->lock);
- return ret;
- }
- /*
- * smb347_is_ps_online - returns whether input power source is connected
- * @smb: pointer to smb347 charger instance
- *
- * Returns %true if input power source is connected. Note that this is
- * dependent on what platform has configured for usable power sources. For
- * example if USB is disabled, this will return %false even if the USB cable
- * is connected.
- */
- static bool smb347_is_ps_online(struct smb347_charger *smb)
- {
- bool ret;
- mutex_lock(&smb->lock);
- ret = smb->usb_online || smb->mains_online;
- mutex_unlock(&smb->lock);
- return ret;
- }
- /**
- * smb347_charging_status - returns status of charging
- * @smb: pointer to smb347 charger instance
- *
- * Function returns charging status. %0 means no charging is in progress,
- * %1 means pre-charging, %2 fast-charging and %3 taper-charging.
- */
- static int smb347_charging_status(struct smb347_charger *smb)
- {
- unsigned int val;
- int ret;
- if (!smb347_is_ps_online(smb))
- return 0;
- ret = regmap_read(smb->regmap, STAT_C, &val);
- if (ret < 0)
- return 0;
- return (val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT;
- }
- static int smb347_charging_set(struct smb347_charger *smb, bool enable)
- {
- int ret = 0;
- if (smb->pdata->enable_control != SMB347_CHG_ENABLE_SW) {
- dev_dbg(smb->dev, "charging enable/disable in SW disabled\n");
- return 0;
- }
- mutex_lock(&smb->lock);
- if (smb->charging_enabled != enable) {
- ret = regmap_update_bits(smb->regmap, CMD_A, CMD_A_CHG_ENABLED,
- enable ? CMD_A_CHG_ENABLED : 0);
- if (!ret)
- smb->charging_enabled = enable;
- }
- mutex_unlock(&smb->lock);
- return ret;
- }
- static inline int smb347_charging_enable(struct smb347_charger *smb)
- {
- return smb347_charging_set(smb, true);
- }
- static inline int smb347_charging_disable(struct smb347_charger *smb)
- {
- return smb347_charging_set(smb, false);
- }
- static int smb347_start_stop_charging(struct smb347_charger *smb)
- {
- int ret;
- /*
- * Depending on whether valid power source is connected or not, we
- * disable or enable the charging. We do it manually because it
- * depends on how the platform has configured the valid inputs.
- */
- if (smb347_is_ps_online(smb)) {
- ret = smb347_charging_enable(smb);
- if (ret < 0)
- dev_err(smb->dev, "failed to enable charging\n");
- } else {
- ret = smb347_charging_disable(smb);
- if (ret < 0)
- dev_err(smb->dev, "failed to disable charging\n");
- }
- return ret;
- }
- static int smb347_set_charge_current(struct smb347_charger *smb)
- {
- int ret;
- if (smb->pdata->max_charge_current) {
- ret = current_to_hw(fcc_tbl, ARRAY_SIZE(fcc_tbl),
- smb->pdata->max_charge_current);
- if (ret < 0)
- return ret;
- ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
- CFG_CHARGE_CURRENT_FCC_MASK,
- ret << CFG_CHARGE_CURRENT_FCC_SHIFT);
- if (ret < 0)
- return ret;
- }
- if (smb->pdata->pre_charge_current) {
- ret = current_to_hw(pcc_tbl, ARRAY_SIZE(pcc_tbl),
- smb->pdata->pre_charge_current);
- if (ret < 0)
- return ret;
- ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
- CFG_CHARGE_CURRENT_PCC_MASK,
- ret << CFG_CHARGE_CURRENT_PCC_SHIFT);
- if (ret < 0)
- return ret;
- }
- if (smb->pdata->termination_current) {
- ret = current_to_hw(tc_tbl, ARRAY_SIZE(tc_tbl),
- smb->pdata->termination_current);
- if (ret < 0)
- return ret;
- ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
- CFG_CHARGE_CURRENT_TC_MASK, ret);
- if (ret < 0)
- return ret;
- }
- return 0;
- }
- static int smb347_set_current_limits(struct smb347_charger *smb)
- {
- int ret;
- if (smb->pdata->mains_current_limit) {
- ret = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl),
- smb->pdata->mains_current_limit);
- if (ret < 0)
- return ret;
- ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
- CFG_CURRENT_LIMIT_DC_MASK,
- ret << CFG_CURRENT_LIMIT_DC_SHIFT);
- if (ret < 0)
- return ret;
- }
- if (smb->pdata->usb_hc_current_limit) {
- ret = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl),
- smb->pdata->usb_hc_current_limit);
- if (ret < 0)
- return ret;
- ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
- CFG_CURRENT_LIMIT_USB_MASK, ret);
- if (ret < 0)
- return ret;
- }
- return 0;
- }
- static int smb347_set_voltage_limits(struct smb347_charger *smb)
- {
- int ret;
- if (smb->pdata->pre_to_fast_voltage) {
- ret = smb->pdata->pre_to_fast_voltage;
- /* uV */
- ret = clamp_val(ret, 2400000, 3000000) - 2400000;
- ret /= 200000;
- ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
- CFG_FLOAT_VOLTAGE_THRESHOLD_MASK,
- ret << CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT);
- if (ret < 0)
- return ret;
- }
- if (smb->pdata->max_charge_voltage) {
- ret = smb->pdata->max_charge_voltage;
- /* uV */
- ret = clamp_val(ret, 3500000, 4500000) - 3500000;
- ret /= 20000;
- ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
- CFG_FLOAT_VOLTAGE_FLOAT_MASK, ret);
- if (ret < 0)
- return ret;
- }
- return 0;
- }
- static int smb347_set_temp_limits(struct smb347_charger *smb)
- {
- bool enable_therm_monitor = false;
- int ret = 0;
- int val;
- if (smb->pdata->chip_temp_threshold) {
- val = smb->pdata->chip_temp_threshold;
- /* degree C */
- val = clamp_val(val, 100, 130) - 100;
- val /= 10;
- ret = regmap_update_bits(smb->regmap, CFG_OTG,
- CFG_OTG_TEMP_THRESHOLD_MASK,
- val << CFG_OTG_TEMP_THRESHOLD_SHIFT);
- if (ret < 0)
- return ret;
- }
- if (smb->pdata->soft_cold_temp_limit != SMB347_TEMP_USE_DEFAULT) {
- val = smb->pdata->soft_cold_temp_limit;
- val = clamp_val(val, 0, 15);
- val /= 5;
- /* this goes from higher to lower so invert the value */
- val = ~val & 0x3;
- ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
- CFG_TEMP_LIMIT_SOFT_COLD_MASK,
- val << CFG_TEMP_LIMIT_SOFT_COLD_SHIFT);
- if (ret < 0)
- return ret;
- enable_therm_monitor = true;
- }
- if (smb->pdata->soft_hot_temp_limit != SMB347_TEMP_USE_DEFAULT) {
- val = smb->pdata->soft_hot_temp_limit;
- val = clamp_val(val, 40, 55) - 40;
- val /= 5;
- ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
- CFG_TEMP_LIMIT_SOFT_HOT_MASK,
- val << CFG_TEMP_LIMIT_SOFT_HOT_SHIFT);
- if (ret < 0)
- return ret;
- enable_therm_monitor = true;
- }
- if (smb->pdata->hard_cold_temp_limit != SMB347_TEMP_USE_DEFAULT) {
- val = smb->pdata->hard_cold_temp_limit;
- val = clamp_val(val, -5, 10) + 5;
- val /= 5;
- /* this goes from higher to lower so invert the value */
- val = ~val & 0x3;
- ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
- CFG_TEMP_LIMIT_HARD_COLD_MASK,
- val << CFG_TEMP_LIMIT_HARD_COLD_SHIFT);
- if (ret < 0)
- return ret;
- enable_therm_monitor = true;
- }
- if (smb->pdata->hard_hot_temp_limit != SMB347_TEMP_USE_DEFAULT) {
- val = smb->pdata->hard_hot_temp_limit;
- val = clamp_val(val, 50, 65) - 50;
- val /= 5;
- ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
- CFG_TEMP_LIMIT_HARD_HOT_MASK,
- val << CFG_TEMP_LIMIT_HARD_HOT_SHIFT);
- if (ret < 0)
- return ret;
- enable_therm_monitor = true;
- }
- /*
- * If any of the temperature limits are set, we also enable the
- * thermistor monitoring.
- *
- * When soft limits are hit, the device will start to compensate
- * current and/or voltage depending on the configuration.
- *
- * When hard limit is hit, the device will suspend charging
- * depending on the configuration.
- */
- if (enable_therm_monitor) {
- ret = regmap_update_bits(smb->regmap, CFG_THERM,
- CFG_THERM_MONITOR_DISABLED, 0);
- if (ret < 0)
- return ret;
- }
- if (smb->pdata->suspend_on_hard_temp_limit) {
- ret = regmap_update_bits(smb->regmap, CFG_SYSOK,
- CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED, 0);
- if (ret < 0)
- return ret;
- }
- if (smb->pdata->soft_temp_limit_compensation !=
- SMB347_SOFT_TEMP_COMPENSATE_DEFAULT) {
- val = smb->pdata->soft_temp_limit_compensation & 0x3;
- ret = regmap_update_bits(smb->regmap, CFG_THERM,
- CFG_THERM_SOFT_HOT_COMPENSATION_MASK,
- val << CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT);
- if (ret < 0)
- return ret;
- ret = regmap_update_bits(smb->regmap, CFG_THERM,
- CFG_THERM_SOFT_COLD_COMPENSATION_MASK,
- val << CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT);
- if (ret < 0)
- return ret;
- }
- if (smb->pdata->charge_current_compensation) {
- val = current_to_hw(ccc_tbl, ARRAY_SIZE(ccc_tbl),
- smb->pdata->charge_current_compensation);
- if (val < 0)
- return val;
- ret = regmap_update_bits(smb->regmap, CFG_OTG,
- CFG_OTG_CC_COMPENSATION_MASK,
- (val & 0x3) << CFG_OTG_CC_COMPENSATION_SHIFT);
- if (ret < 0)
- return ret;
- }
- return ret;
- }
- /*
- * smb347_set_writable - enables/disables writing to non-volatile registers
- * @smb: pointer to smb347 charger instance
- *
- * You can enable/disable writing to the non-volatile configuration
- * registers by calling this function.
- *
- * Returns %0 on success and negative errno in case of failure.
- */
- static int smb347_set_writable(struct smb347_charger *smb, bool writable)
- {
- return regmap_update_bits(smb->regmap, CMD_A, CMD_A_ALLOW_WRITE,
- writable ? CMD_A_ALLOW_WRITE : 0);
- }
- static int smb347_hw_init(struct smb347_charger *smb)
- {
- unsigned int val;
- int ret;
- ret = smb347_set_writable(smb, true);
- if (ret < 0)
- return ret;
- /*
- * Program the platform specific configuration values to the device
- * first.
- */
- ret = smb347_set_charge_current(smb);
- if (ret < 0)
- goto fail;
- ret = smb347_set_current_limits(smb);
- if (ret < 0)
- goto fail;
- ret = smb347_set_voltage_limits(smb);
- if (ret < 0)
- goto fail;
- ret = smb347_set_temp_limits(smb);
- if (ret < 0)
- goto fail;
- /* If USB charging is disabled we put the USB in suspend mode */
- if (!smb->pdata->use_usb) {
- ret = regmap_update_bits(smb->regmap, CMD_A,
- CMD_A_SUSPEND_ENABLED,
- CMD_A_SUSPEND_ENABLED);
- if (ret < 0)
- goto fail;
- }
- /*
- * If configured by platform data, we enable hardware Auto-OTG
- * support for driving VBUS. Otherwise we disable it.
- */
- ret = regmap_update_bits(smb->regmap, CFG_OTHER, CFG_OTHER_RID_MASK,
- smb->pdata->use_usb_otg ? CFG_OTHER_RID_ENABLED_AUTO_OTG : 0);
- if (ret < 0)
- goto fail;
- /*
- * Make the charging functionality controllable by a write to the
- * command register unless pin control is specified in the platform
- * data.
- */
- switch (smb->pdata->enable_control) {
- case SMB347_CHG_ENABLE_PIN_ACTIVE_LOW:
- val = CFG_PIN_EN_CTRL_ACTIVE_LOW;
- break;
- case SMB347_CHG_ENABLE_PIN_ACTIVE_HIGH:
- val = CFG_PIN_EN_CTRL_ACTIVE_HIGH;
- break;
- default:
- val = 0;
- break;
- }
- ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CTRL_MASK,
- val);
- if (ret < 0)
- goto fail;
- /* Disable Automatic Power Source Detection (APSD) interrupt. */
- ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_APSD_IRQ, 0);
- if (ret < 0)
- goto fail;
- ret = smb347_update_ps_status(smb);
- if (ret < 0)
- goto fail;
- ret = smb347_start_stop_charging(smb);
- fail:
- smb347_set_writable(smb, false);
- return ret;
- }
- static irqreturn_t smb347_interrupt(int irq, void *data)
- {
- struct smb347_charger *smb = data;
- unsigned int stat_c, irqstat_c, irqstat_d, irqstat_e;
- bool handled = false;
- int ret;
- ret = regmap_read(smb->regmap, STAT_C, &stat_c);
- if (ret < 0) {
- dev_warn(smb->dev, "reading STAT_C failed\n");
- return IRQ_NONE;
- }
- ret = regmap_read(smb->regmap, IRQSTAT_C, &irqstat_c);
- if (ret < 0) {
- dev_warn(smb->dev, "reading IRQSTAT_C failed\n");
- return IRQ_NONE;
- }
- ret = regmap_read(smb->regmap, IRQSTAT_D, &irqstat_d);
- if (ret < 0) {
- dev_warn(smb->dev, "reading IRQSTAT_D failed\n");
- return IRQ_NONE;
- }
- ret = regmap_read(smb->regmap, IRQSTAT_E, &irqstat_e);
- if (ret < 0) {
- dev_warn(smb->dev, "reading IRQSTAT_E failed\n");
- return IRQ_NONE;
- }
- /*
- * If we get charger error we report the error back to user.
- * If the error is recovered charging will resume again.
- */
- if (stat_c & STAT_C_CHARGER_ERROR) {
- dev_err(smb->dev, "charging stopped due to charger error\n");
- power_supply_changed(smb->battery);
- handled = true;
- }
- /*
- * If we reached the termination current the battery is charged and
- * we can update the status now. Charging is automatically
- * disabled by the hardware.
- */
- if (irqstat_c & (IRQSTAT_C_TERMINATION_IRQ | IRQSTAT_C_TAPER_IRQ)) {
- if (irqstat_c & IRQSTAT_C_TERMINATION_STAT)
- power_supply_changed(smb->battery);
- dev_dbg(smb->dev, "going to HW maintenance mode\n");
- handled = true;
- }
- /*
- * If we got a charger timeout INT that means the charge
- * full is not detected with in charge timeout value.
- */
- if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_IRQ) {
- dev_dbg(smb->dev, "total Charge Timeout INT received\n");
- if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_STAT)
- dev_warn(smb->dev, "charging stopped due to timeout\n");
- power_supply_changed(smb->battery);
- handled = true;
- }
- /*
- * If we got an under voltage interrupt it means that AC/USB input
- * was connected or disconnected.
- */
- if (irqstat_e & (IRQSTAT_E_USBIN_UV_IRQ | IRQSTAT_E_DCIN_UV_IRQ)) {
- if (smb347_update_ps_status(smb) > 0) {
- smb347_start_stop_charging(smb);
- if (smb->pdata->use_mains)
- power_supply_changed(smb->mains);
- if (smb->pdata->use_usb)
- power_supply_changed(smb->usb);
- }
- handled = true;
- }
- return handled ? IRQ_HANDLED : IRQ_NONE;
- }
- static int smb347_irq_set(struct smb347_charger *smb, bool enable)
- {
- int ret;
- ret = smb347_set_writable(smb, true);
- if (ret < 0)
- return ret;
- /*
- * Enable/disable interrupts for:
- * - under voltage
- * - termination current reached
- * - charger timeout
- * - charger error
- */
- ret = regmap_update_bits(smb->regmap, CFG_FAULT_IRQ, 0xff,
- enable ? CFG_FAULT_IRQ_DCIN_UV : 0);
- if (ret < 0)
- goto fail;
- ret = regmap_update_bits(smb->regmap, CFG_STATUS_IRQ, 0xff,
- enable ? (CFG_STATUS_IRQ_TERMINATION_OR_TAPER |
- CFG_STATUS_IRQ_CHARGE_TIMEOUT) : 0);
- if (ret < 0)
- goto fail;
- ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CHARGER_ERROR,
- enable ? CFG_PIN_EN_CHARGER_ERROR : 0);
- fail:
- smb347_set_writable(smb, false);
- return ret;
- }
- static inline int smb347_irq_enable(struct smb347_charger *smb)
- {
- return smb347_irq_set(smb, true);
- }
- static inline int smb347_irq_disable(struct smb347_charger *smb)
- {
- return smb347_irq_set(smb, false);
- }
- static int smb347_irq_init(struct smb347_charger *smb,
- struct i2c_client *client)
- {
- const struct smb347_charger_platform_data *pdata = smb->pdata;
- int ret, irq = gpio_to_irq(pdata->irq_gpio);
- ret = gpio_request_one(pdata->irq_gpio, GPIOF_IN, client->name);
- if (ret < 0)
- goto fail;
- ret = request_threaded_irq(irq, NULL, smb347_interrupt,
- IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
- client->name, smb);
- if (ret < 0)
- goto fail_gpio;
- ret = smb347_set_writable(smb, true);
- if (ret < 0)
- goto fail_irq;
- /*
- * Configure the STAT output to be suitable for interrupts: disable
- * all other output (except interrupts) and make it active low.
- */
- ret = regmap_update_bits(smb->regmap, CFG_STAT,
- CFG_STAT_ACTIVE_HIGH | CFG_STAT_DISABLED,
- CFG_STAT_DISABLED);
- if (ret < 0)
- goto fail_readonly;
- smb347_set_writable(smb, false);
- client->irq = irq;
- return 0;
- fail_readonly:
- smb347_set_writable(smb, false);
- fail_irq:
- free_irq(irq, smb);
- fail_gpio:
- gpio_free(pdata->irq_gpio);
- fail:
- client->irq = 0;
- return ret;
- }
- /*
- * Returns the constant charge current programmed
- * into the charger in uA.
- */
- static int get_const_charge_current(struct smb347_charger *smb)
- {
- int ret, intval;
- unsigned int v;
- if (!smb347_is_ps_online(smb))
- return -ENODATA;
- ret = regmap_read(smb->regmap, STAT_B, &v);
- if (ret < 0)
- return ret;
- /*
- * The current value is composition of FCC and PCC values
- * and we can detect which table to use from bit 5.
- */
- if (v & 0x20) {
- intval = hw_to_current(fcc_tbl, ARRAY_SIZE(fcc_tbl), v & 7);
- } else {
- v >>= 3;
- intval = hw_to_current(pcc_tbl, ARRAY_SIZE(pcc_tbl), v & 7);
- }
- return intval;
- }
- /*
- * Returns the constant charge voltage programmed
- * into the charger in uV.
- */
- static int get_const_charge_voltage(struct smb347_charger *smb)
- {
- int ret, intval;
- unsigned int v;
- if (!smb347_is_ps_online(smb))
- return -ENODATA;
- ret = regmap_read(smb->regmap, STAT_A, &v);
- if (ret < 0)
- return ret;
- v &= STAT_A_FLOAT_VOLTAGE_MASK;
- if (v > 0x3d)
- v = 0x3d;
- intval = 3500000 + v * 20000;
- return intval;
- }
- static int smb347_mains_get_property(struct power_supply *psy,
- enum power_supply_property prop,
- union power_supply_propval *val)
- {
- struct smb347_charger *smb = power_supply_get_drvdata(psy);
- int ret;
- switch (prop) {
- case POWER_SUPPLY_PROP_ONLINE:
- val->intval = smb->mains_online;
- break;
- case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
- ret = get_const_charge_voltage(smb);
- if (ret < 0)
- return ret;
- else
- val->intval = ret;
- break;
- case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
- ret = get_const_charge_current(smb);
- if (ret < 0)
- return ret;
- else
- val->intval = ret;
- break;
- default:
- return -EINVAL;
- }
- return 0;
- }
- static enum power_supply_property smb347_mains_properties[] = {
- POWER_SUPPLY_PROP_ONLINE,
- POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
- POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
- };
- static int smb347_usb_get_property(struct power_supply *psy,
- enum power_supply_property prop,
- union power_supply_propval *val)
- {
- struct smb347_charger *smb = power_supply_get_drvdata(psy);
- int ret;
- switch (prop) {
- case POWER_SUPPLY_PROP_ONLINE:
- val->intval = smb->usb_online;
- break;
- case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
- ret = get_const_charge_voltage(smb);
- if (ret < 0)
- return ret;
- else
- val->intval = ret;
- break;
- case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
- ret = get_const_charge_current(smb);
- if (ret < 0)
- return ret;
- else
- val->intval = ret;
- break;
- default:
- return -EINVAL;
- }
- return 0;
- }
- static enum power_supply_property smb347_usb_properties[] = {
- POWER_SUPPLY_PROP_ONLINE,
- POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
- POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
- };
- static int smb347_get_charging_status(struct smb347_charger *smb)
- {
- int ret, status;
- unsigned int val;
- if (!smb347_is_ps_online(smb))
- return POWER_SUPPLY_STATUS_DISCHARGING;
- ret = regmap_read(smb->regmap, STAT_C, &val);
- if (ret < 0)
- return ret;
- if ((val & STAT_C_CHARGER_ERROR) ||
- (val & STAT_C_HOLDOFF_STAT)) {
- /*
- * set to NOT CHARGING upon charger error
- * or charging has stopped.
- */
- status = POWER_SUPPLY_STATUS_NOT_CHARGING;
- } else {
- if ((val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT) {
- /*
- * set to charging if battery is in pre-charge,
- * fast charge or taper charging mode.
- */
- status = POWER_SUPPLY_STATUS_CHARGING;
- } else if (val & STAT_C_CHG_TERM) {
- /*
- * set the status to FULL if battery is not in pre
- * charge, fast charge or taper charging mode AND
- * charging is terminated at least once.
- */
- status = POWER_SUPPLY_STATUS_FULL;
- } else {
- /*
- * in this case no charger error or termination
- * occured but charging is not in progress!!!
- */
- status = POWER_SUPPLY_STATUS_NOT_CHARGING;
- }
- }
- return status;
- }
- static int smb347_battery_get_property(struct power_supply *psy,
- enum power_supply_property prop,
- union power_supply_propval *val)
- {
- struct smb347_charger *smb = power_supply_get_drvdata(psy);
- const struct smb347_charger_platform_data *pdata = smb->pdata;
- int ret;
- ret = smb347_update_ps_status(smb);
- if (ret < 0)
- return ret;
- switch (prop) {
- case POWER_SUPPLY_PROP_STATUS:
- ret = smb347_get_charging_status(smb);
- if (ret < 0)
- return ret;
- val->intval = ret;
- break;
- case POWER_SUPPLY_PROP_CHARGE_TYPE:
- if (!smb347_is_ps_online(smb))
- return -ENODATA;
- /*
- * We handle trickle and pre-charging the same, and taper
- * and none the same.
- */
- switch (smb347_charging_status(smb)) {
- case 1:
- val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
- break;
- case 2:
- val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
- break;
- default:
- val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
- break;
- }
- break;
- case POWER_SUPPLY_PROP_TECHNOLOGY:
- val->intval = pdata->battery_info.technology;
- break;
- case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
- val->intval = pdata->battery_info.voltage_min_design;
- break;
- case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
- val->intval = pdata->battery_info.voltage_max_design;
- break;
- case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
- val->intval = pdata->battery_info.charge_full_design;
- break;
- case POWER_SUPPLY_PROP_MODEL_NAME:
- val->strval = pdata->battery_info.name;
- break;
- default:
- return -EINVAL;
- }
- return 0;
- }
- static enum power_supply_property smb347_battery_properties[] = {
- POWER_SUPPLY_PROP_STATUS,
- POWER_SUPPLY_PROP_CHARGE_TYPE,
- POWER_SUPPLY_PROP_TECHNOLOGY,
- POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
- POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
- POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
- POWER_SUPPLY_PROP_MODEL_NAME,
- };
- static bool smb347_volatile_reg(struct device *dev, unsigned int reg)
- {
- switch (reg) {
- case IRQSTAT_A:
- case IRQSTAT_C:
- case IRQSTAT_E:
- case IRQSTAT_F:
- case STAT_A:
- case STAT_B:
- case STAT_C:
- case STAT_E:
- return true;
- }
- return false;
- }
- static bool smb347_readable_reg(struct device *dev, unsigned int reg)
- {
- switch (reg) {
- case CFG_CHARGE_CURRENT:
- case CFG_CURRENT_LIMIT:
- case CFG_FLOAT_VOLTAGE:
- case CFG_STAT:
- case CFG_PIN:
- case CFG_THERM:
- case CFG_SYSOK:
- case CFG_OTHER:
- case CFG_OTG:
- case CFG_TEMP_LIMIT:
- case CFG_FAULT_IRQ:
- case CFG_STATUS_IRQ:
- case CFG_ADDRESS:
- case CMD_A:
- case CMD_B:
- case CMD_C:
- return true;
- }
- return smb347_volatile_reg(dev, reg);
- }
- static const struct regmap_config smb347_regmap = {
- .reg_bits = 8,
- .val_bits = 8,
- .max_register = SMB347_MAX_REGISTER,
- .volatile_reg = smb347_volatile_reg,
- .readable_reg = smb347_readable_reg,
- };
- static const struct power_supply_desc smb347_mains_desc = {
- .name = "smb347-mains",
- .type = POWER_SUPPLY_TYPE_MAINS,
- .get_property = smb347_mains_get_property,
- .properties = smb347_mains_properties,
- .num_properties = ARRAY_SIZE(smb347_mains_properties),
- };
- static const struct power_supply_desc smb347_usb_desc = {
- .name = "smb347-usb",
- .type = POWER_SUPPLY_TYPE_USB,
- .get_property = smb347_usb_get_property,
- .properties = smb347_usb_properties,
- .num_properties = ARRAY_SIZE(smb347_usb_properties),
- };
- static const struct power_supply_desc smb347_battery_desc = {
- .name = "smb347-battery",
- .type = POWER_SUPPLY_TYPE_BATTERY,
- .get_property = smb347_battery_get_property,
- .properties = smb347_battery_properties,
- .num_properties = ARRAY_SIZE(smb347_battery_properties),
- };
- static int smb347_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
- {
- static char *battery[] = { "smb347-battery" };
- const struct smb347_charger_platform_data *pdata;
- struct power_supply_config mains_usb_cfg = {}, battery_cfg = {};
- struct device *dev = &client->dev;
- struct smb347_charger *smb;
- int ret;
- pdata = dev->platform_data;
- if (!pdata)
- return -EINVAL;
- if (!pdata->use_mains && !pdata->use_usb)
- return -EINVAL;
- smb = devm_kzalloc(dev, sizeof(*smb), GFP_KERNEL);
- if (!smb)
- return -ENOMEM;
- i2c_set_clientdata(client, smb);
- mutex_init(&smb->lock);
- smb->dev = &client->dev;
- smb->pdata = pdata;
- smb->regmap = devm_regmap_init_i2c(client, &smb347_regmap);
- if (IS_ERR(smb->regmap))
- return PTR_ERR(smb->regmap);
- ret = smb347_hw_init(smb);
- if (ret < 0)
- return ret;
- mains_usb_cfg.supplied_to = battery;
- mains_usb_cfg.num_supplicants = ARRAY_SIZE(battery);
- mains_usb_cfg.drv_data = smb;
- if (smb->pdata->use_mains) {
- smb->mains = power_supply_register(dev, &smb347_mains_desc,
- &mains_usb_cfg);
- if (IS_ERR(smb->mains))
- return PTR_ERR(smb->mains);
- }
- if (smb->pdata->use_usb) {
- smb->usb = power_supply_register(dev, &smb347_usb_desc,
- &mains_usb_cfg);
- if (IS_ERR(smb->usb)) {
- if (smb->pdata->use_mains)
- power_supply_unregister(smb->mains);
- return PTR_ERR(smb->usb);
- }
- }
- battery_cfg.drv_data = smb;
- smb->battery = power_supply_register(dev, &smb347_battery_desc,
- &battery_cfg);
- if (IS_ERR(smb->battery)) {
- if (smb->pdata->use_usb)
- power_supply_unregister(smb->usb);
- if (smb->pdata->use_mains)
- power_supply_unregister(smb->mains);
- return PTR_ERR(smb->battery);
- }
- /*
- * Interrupt pin is optional. If it is connected, we setup the
- * interrupt support here.
- */
- if (pdata->irq_gpio >= 0) {
- ret = smb347_irq_init(smb, client);
- if (ret < 0) {
- dev_warn(dev, "failed to initialize IRQ: %d\n", ret);
- dev_warn(dev, "disabling IRQ support\n");
- } else {
- smb347_irq_enable(smb);
- }
- }
- return 0;
- }
- static int smb347_remove(struct i2c_client *client)
- {
- struct smb347_charger *smb = i2c_get_clientdata(client);
- if (client->irq) {
- smb347_irq_disable(smb);
- free_irq(client->irq, smb);
- gpio_free(smb->pdata->irq_gpio);
- }
- power_supply_unregister(smb->battery);
- if (smb->pdata->use_usb)
- power_supply_unregister(smb->usb);
- if (smb->pdata->use_mains)
- power_supply_unregister(smb->mains);
- return 0;
- }
- static const struct i2c_device_id smb347_id[] = {
- { "smb347", 0 },
- { }
- };
- MODULE_DEVICE_TABLE(i2c, smb347_id);
- static struct i2c_driver smb347_driver = {
- .driver = {
- .name = "smb347",
- },
- .probe = smb347_probe,
- .remove = smb347_remove,
- .id_table = smb347_id,
- };
- module_i2c_driver(smb347_driver);
- MODULE_AUTHOR("Bruce E. Robertson <bruce.e.robertson@intel.com>");
- MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
- MODULE_DESCRIPTION("SMB347 battery charger driver");
- MODULE_LICENSE("GPL");
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