| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Bruce E. Robertson | 3229 | 66.10% | 1 | 7.69% |
| Mika Westerberg | 739 | 15.13% | 5 | 38.46% |
| Ramakrishna Pallala | 718 | 14.70% | 3 | 23.08% |
| Krzysztof Kozlowski | 195 | 3.99% | 2 | 15.38% |
| Thomas Gleixner | 2 | 0.04% | 1 | 7.69% |
| Valentin Rothberg | 2 | 0.04% | 1 | 7.69% |
| Total | 4885 | 13 |
// SPDX-License-Identifier: GPL-2.0-only /* * 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> */ #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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