/* * Summit Microelectronics SMB347 Battery Charger Driver * * Copyright (C) 2011, Intel Corporation * * Authors: Bruce E. Robertson * Mika Westerberg * * 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 #include #include #include #include #include #include #include #include #include #include /* * 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_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_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_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_CHG_MASK 0x06 #define STAT_C_CHG_SHIFT 1 #define STAT_C_CHARGER_ERROR BIT(6) #define STAT_E 0x3f /** * struct smb347_charger - smb347 charger instance * @lock: protects concurrent access to online variables * @client: pointer to i2c client * @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 * @dentry: for debugfs * @pdata: pointer to platform data */ struct smb347_charger { struct mutex lock; struct i2c_client *client; struct power_supply mains; struct power_supply usb; struct power_supply battery; bool mains_online; bool usb_online; bool charging_enabled; struct dentry *dentry; 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; } static int smb347_read(struct smb347_charger *smb, u8 reg) { int ret; ret = i2c_smbus_read_byte_data(smb->client, reg); if (ret < 0) dev_warn(&smb->client->dev, "failed to read reg 0x%x: %d\n", reg, ret); return ret; } static int smb347_write(struct smb347_charger *smb, u8 reg, u8 val) { int ret; ret = i2c_smbus_write_byte_data(smb->client, reg, val); if (ret < 0) dev_warn(&smb->client->dev, "failed to write reg 0x%x: %d\n", reg, ret); return ret; } /** * 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; int ret; ret = smb347_read(smb, IRQSTAT_E); 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 = !(ret & IRQSTAT_E_DCIN_UV_STAT); if (smb->pdata->use_usb) usb = !(ret & 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) { int ret; if (!smb347_is_ps_online(smb)) return 0; ret = smb347_read(smb, STAT_C); if (ret < 0) return 0; return (ret & 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->client->dev, "charging enable/disable in SW disabled\n"); return 0; } mutex_lock(&smb->lock); if (smb->charging_enabled != enable) { ret = smb347_read(smb, CMD_A); if (ret < 0) goto out; smb->charging_enabled = enable; if (enable) ret |= CMD_A_CHG_ENABLED; else ret &= ~CMD_A_CHG_ENABLED; ret = smb347_write(smb, CMD_A, ret); } out: 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->client->dev, "failed to enable charging\n"); } else { ret = smb347_charging_disable(smb); if (ret < 0) dev_err(&smb->client->dev, "failed to disable charging\n"); } return ret; } static int smb347_set_charge_current(struct smb347_charger *smb) { int ret, val; ret = smb347_read(smb, CFG_CHARGE_CURRENT); if (ret < 0) return ret; if (smb->pdata->max_charge_current) { val = current_to_hw(fcc_tbl, ARRAY_SIZE(fcc_tbl), smb->pdata->max_charge_current); if (val < 0) return val; ret &= ~CFG_CHARGE_CURRENT_FCC_MASK; ret |= val << CFG_CHARGE_CURRENT_FCC_SHIFT; } if (smb->pdata->pre_charge_current) { val = current_to_hw(pcc_tbl, ARRAY_SIZE(pcc_tbl), smb->pdata->pre_charge_current); if (val < 0) return val; ret &= ~CFG_CHARGE_CURRENT_PCC_MASK; ret |= val << CFG_CHARGE_CURRENT_PCC_SHIFT; } if (smb->pdata->termination_current) { val = current_to_hw(tc_tbl, ARRAY_SIZE(tc_tbl), smb->pdata->termination_current); if (val < 0) return val; ret &= ~CFG_CHARGE_CURRENT_TC_MASK; ret |= val; } return smb347_write(smb, CFG_CHARGE_CURRENT, ret); } static int smb347_set_current_limits(struct smb347_charger *smb) { int ret, val; ret = smb347_read(smb, CFG_CURRENT_LIMIT); if (ret < 0) return ret; if (smb->pdata->mains_current_limit) { val = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl), smb->pdata->mains_current_limit); if (val < 0) return val; ret &= ~CFG_CURRENT_LIMIT_DC_MASK; ret |= val << CFG_CURRENT_LIMIT_DC_SHIFT; } if (smb->pdata->usb_hc_current_limit) { val = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl), smb->pdata->usb_hc_current_limit); if (val < 0) return val; ret &= ~CFG_CURRENT_LIMIT_USB_MASK; ret |= val; } return smb347_write(smb, CFG_CURRENT_LIMIT, ret); } static int smb347_set_voltage_limits(struct smb347_charger *smb) { int ret, val; ret = smb347_read(smb, CFG_FLOAT_VOLTAGE); if (ret < 0) return ret; if (smb->pdata->pre_to_fast_voltage) { val = smb->pdata->pre_to_fast_voltage; /* uV */ val = clamp_val(val, 2400000, 3000000) - 2400000; val /= 200000; ret &= ~CFG_FLOAT_VOLTAGE_THRESHOLD_MASK; ret |= val << CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT; } if (smb->pdata->max_charge_voltage) { val = smb->pdata->max_charge_voltage; /* uV */ val = clamp_val(val, 3500000, 4500000) - 3500000; val /= 20000; ret |= val; } return smb347_write(smb, CFG_FLOAT_VOLTAGE, ret); } static int smb347_set_temp_limits(struct smb347_charger *smb) { bool enable_therm_monitor = false; int ret, 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 = smb347_read(smb, CFG_OTG); if (ret < 0) return ret; ret &= ~CFG_OTG_TEMP_THRESHOLD_MASK; ret |= val << CFG_OTG_TEMP_THRESHOLD_SHIFT; ret = smb347_write(smb, CFG_OTG, ret); if (ret < 0) return ret; } ret = smb347_read(smb, CFG_TEMP_LIMIT); 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 &= ~CFG_TEMP_LIMIT_SOFT_COLD_MASK; ret |= val << CFG_TEMP_LIMIT_SOFT_COLD_SHIFT; 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 &= ~CFG_TEMP_LIMIT_SOFT_HOT_MASK; ret |= val << CFG_TEMP_LIMIT_SOFT_HOT_SHIFT; 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 &= ~CFG_TEMP_LIMIT_HARD_COLD_MASK; ret |= val << CFG_TEMP_LIMIT_HARD_COLD_SHIFT; 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 &= ~CFG_TEMP_LIMIT_HARD_HOT_MASK; ret |= val << CFG_TEMP_LIMIT_HARD_HOT_SHIFT; enable_therm_monitor = true; } ret = smb347_write(smb, CFG_TEMP_LIMIT, ret); if (ret < 0) return ret; /* * 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 = smb347_read(smb, CFG_THERM); if (ret < 0) return ret; ret &= ~CFG_THERM_MONITOR_DISABLED; ret = smb347_write(smb, CFG_THERM, ret); if (ret < 0) return ret; } if (smb->pdata->suspend_on_hard_temp_limit) { ret = smb347_read(smb, CFG_SYSOK); if (ret < 0) return ret; ret &= ~CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED; ret = smb347_write(smb, CFG_SYSOK, ret); 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 = smb347_read(smb, CFG_THERM); if (ret < 0) return ret; ret &= ~CFG_THERM_SOFT_HOT_COMPENSATION_MASK; ret |= val << CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT; ret &= ~CFG_THERM_SOFT_COLD_COMPENSATION_MASK; ret |= val << CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT; ret = smb347_write(smb, CFG_THERM, ret); 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 = smb347_read(smb, CFG_OTG); if (ret < 0) return ret; ret &= ~CFG_OTG_CC_COMPENSATION_MASK; ret |= (val & 0x3) << CFG_OTG_CC_COMPENSATION_SHIFT; ret = smb347_write(smb, CFG_OTG, ret); 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) { int ret; ret = smb347_read(smb, CMD_A); if (ret < 0) return ret; if (writable) ret |= CMD_A_ALLOW_WRITE; else ret &= ~CMD_A_ALLOW_WRITE; return smb347_write(smb, CMD_A, ret); } static int smb347_hw_init(struct smb347_charger *smb) { 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 = smb347_read(smb, CMD_A); if (ret < 0) goto fail; ret |= CMD_A_SUSPEND_ENABLED; ret = smb347_write(smb, CMD_A, ret); if (ret < 0) goto fail; } ret = smb347_read(smb, CFG_OTHER); if (ret < 0) goto fail; /* * If configured by platform data, we enable hardware Auto-OTG * support for driving VBUS. Otherwise we disable it. */ ret &= ~CFG_OTHER_RID_MASK; if (smb->pdata->use_usb_otg) ret |= CFG_OTHER_RID_ENABLED_AUTO_OTG; ret = smb347_write(smb, CFG_OTHER, ret); if (ret < 0) goto fail; ret = smb347_read(smb, CFG_PIN); 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. */ ret &= ~CFG_PIN_EN_CTRL_MASK; switch (smb->pdata->enable_control) { case SMB347_CHG_ENABLE_SW: /* Do nothing, 0 means i2c control */ break; case SMB347_CHG_ENABLE_PIN_ACTIVE_LOW: ret |= CFG_PIN_EN_CTRL_ACTIVE_LOW; break; case SMB347_CHG_ENABLE_PIN_ACTIVE_HIGH: ret |= CFG_PIN_EN_CTRL_ACTIVE_HIGH; break; } /* Disable Automatic Power Source Detection (APSD) interrupt. */ ret &= ~CFG_PIN_EN_APSD_IRQ; ret = smb347_write(smb, CFG_PIN, ret); 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; int stat_c, irqstat_e, irqstat_c; irqreturn_t ret = IRQ_NONE; stat_c = smb347_read(smb, STAT_C); if (stat_c < 0) { dev_warn(&smb->client->dev, "reading STAT_C failed\n"); return IRQ_NONE; } irqstat_c = smb347_read(smb, IRQSTAT_C); if (irqstat_c < 0) { dev_warn(&smb->client->dev, "reading IRQSTAT_C failed\n"); return IRQ_NONE; } irqstat_e = smb347_read(smb, IRQSTAT_E); if (irqstat_e < 0) { dev_warn(&smb->client->dev, "reading IRQSTAT_E failed\n"); return IRQ_NONE; } /* * If we get charger error we report the error back to user and * disable charging. */ if (stat_c & STAT_C_CHARGER_ERROR) { dev_err(&smb->client->dev, "error in charger, disabling charging\n"); smb347_charging_disable(smb); power_supply_changed(&smb->battery); ret = IRQ_HANDLED; } /* * 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); ret = IRQ_HANDLED; } /* * 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); } ret = IRQ_HANDLED; } return ret; } 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 error */ if (enable) { ret = smb347_write(smb, CFG_FAULT_IRQ, CFG_FAULT_IRQ_DCIN_UV); if (ret < 0) goto fail; ret = smb347_write(smb, CFG_STATUS_IRQ, CFG_STATUS_IRQ_TERMINATION_OR_TAPER); if (ret < 0) goto fail; ret = smb347_read(smb, CFG_PIN); if (ret < 0) goto fail; ret |= CFG_PIN_EN_CHARGER_ERROR; ret = smb347_write(smb, CFG_PIN, ret); } else { ret = smb347_write(smb, CFG_FAULT_IRQ, 0); if (ret < 0) goto fail; ret = smb347_write(smb, CFG_STATUS_IRQ, 0); if (ret < 0) goto fail; ret = smb347_read(smb, CFG_PIN); if (ret < 0) goto fail; ret &= ~CFG_PIN_EN_CHARGER_ERROR; ret = smb347_write(smb, CFG_PIN, ret); } 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) { 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, smb->client->name); if (ret < 0) goto fail; ret = request_threaded_irq(irq, NULL, smb347_interrupt, IRQF_TRIGGER_FALLING, smb->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 = smb347_read(smb, CFG_STAT); if (ret < 0) goto fail_readonly; ret &= ~CFG_STAT_ACTIVE_HIGH; ret |= CFG_STAT_DISABLED; ret = smb347_write(smb, CFG_STAT, ret); if (ret < 0) goto fail_readonly; smb347_set_writable(smb, false); smb->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: smb->client->irq = 0; return ret; } static int smb347_mains_get_property(struct power_supply *psy, enum power_supply_property prop, union power_supply_propval *val) { struct smb347_charger *smb = container_of(psy, struct smb347_charger, mains); if (prop == POWER_SUPPLY_PROP_ONLINE) { val->intval = smb->mains_online; return 0; } return -EINVAL; } static enum power_supply_property smb347_mains_properties[] = { POWER_SUPPLY_PROP_ONLINE, }; static int smb347_usb_get_property(struct power_supply *psy, enum power_supply_property prop, union power_supply_propval *val) { struct smb347_charger *smb = container_of(psy, struct smb347_charger, usb); if (prop == POWER_SUPPLY_PROP_ONLINE) { val->intval = smb->usb_online; return 0; } return -EINVAL; } static enum power_supply_property smb347_usb_properties[] = { POWER_SUPPLY_PROP_ONLINE, }; static int smb347_battery_get_property(struct power_supply *psy, enum power_supply_property prop, union power_supply_propval *val) { struct smb347_charger *smb = container_of(psy, struct smb347_charger, battery); 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: if (!smb347_is_ps_online(smb)) { val->intval = POWER_SUPPLY_STATUS_DISCHARGING; break; } if (smb347_charging_status(smb)) val->intval = POWER_SUPPLY_STATUS_CHARGING; else val->intval = POWER_SUPPLY_STATUS_FULL; 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_VOLTAGE_NOW: if (!smb347_is_ps_online(smb)) return -ENODATA; ret = smb347_read(smb, STAT_A); if (ret < 0) return ret; ret &= STAT_A_FLOAT_VOLTAGE_MASK; if (ret > 0x3d) ret = 0x3d; val->intval = 3500000 + ret * 20000; break; case POWER_SUPPLY_PROP_CURRENT_NOW: if (!smb347_is_ps_online(smb)) return -ENODATA; ret = smb347_read(smb, STAT_B); 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 (ret & 0x20) { val->intval = hw_to_current(fcc_tbl, ARRAY_SIZE(fcc_tbl), ret & 7); } else { ret >>= 3; val->intval = hw_to_current(pcc_tbl, ARRAY_SIZE(pcc_tbl), ret & 7); } 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_VOLTAGE_NOW, POWER_SUPPLY_PROP_CURRENT_NOW, POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, POWER_SUPPLY_PROP_MODEL_NAME, }; static int smb347_debugfs_show(struct seq_file *s, void *data) { struct smb347_charger *smb = s->private; int ret; u8 reg; seq_printf(s, "Control registers:\n"); seq_printf(s, "==================\n"); for (reg = CFG_CHARGE_CURRENT; reg <= CFG_ADDRESS; reg++) { ret = smb347_read(smb, reg); seq_printf(s, "0x%02x:\t0x%02x\n", reg, ret); } seq_printf(s, "\n"); seq_printf(s, "Command registers:\n"); seq_printf(s, "==================\n"); ret = smb347_read(smb, CMD_A); seq_printf(s, "0x%02x:\t0x%02x\n", CMD_A, ret); ret = smb347_read(smb, CMD_B); seq_printf(s, "0x%02x:\t0x%02x\n", CMD_B, ret); ret = smb347_read(smb, CMD_C); seq_printf(s, "0x%02x:\t0x%02x\n", CMD_C, ret); seq_printf(s, "\n"); seq_printf(s, "Interrupt status registers:\n"); seq_printf(s, "===========================\n"); for (reg = IRQSTAT_A; reg <= IRQSTAT_F; reg++) { ret = smb347_read(smb, reg); seq_printf(s, "0x%02x:\t0x%02x\n", reg, ret); } seq_printf(s, "\n"); seq_printf(s, "Status registers:\n"); seq_printf(s, "=================\n"); for (reg = STAT_A; reg <= STAT_E; reg++) { ret = smb347_read(smb, reg); seq_printf(s, "0x%02x:\t0x%02x\n", reg, ret); } return 0; } static int smb347_debugfs_open(struct inode *inode, struct file *file) { return single_open(file, smb347_debugfs_show, inode->i_private); } static const struct file_operations smb347_debugfs_fops = { .open = smb347_debugfs_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; 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 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->client = client; smb->pdata = pdata; ret = smb347_hw_init(smb); if (ret < 0) return ret; if (smb->pdata->use_mains) { smb->mains.name = "smb347-mains"; smb->mains.type = POWER_SUPPLY_TYPE_MAINS; smb->mains.get_property = smb347_mains_get_property; smb->mains.properties = smb347_mains_properties; smb->mains.num_properties = ARRAY_SIZE(smb347_mains_properties); smb->mains.supplied_to = battery; smb->mains.num_supplicants = ARRAY_SIZE(battery); ret = power_supply_register(dev, &smb->mains); if (ret < 0) return ret; } if (smb->pdata->use_usb) { smb->usb.name = "smb347-usb"; smb->usb.type = POWER_SUPPLY_TYPE_USB; smb->usb.get_property = smb347_usb_get_property; smb->usb.properties = smb347_usb_properties; smb->usb.num_properties = ARRAY_SIZE(smb347_usb_properties); smb->usb.supplied_to = battery; smb->usb.num_supplicants = ARRAY_SIZE(battery); ret = power_supply_register(dev, &smb->usb); if (ret < 0) { if (smb->pdata->use_mains) power_supply_unregister(&smb->mains); return ret; } } smb->battery.name = "smb347-battery"; smb->battery.type = POWER_SUPPLY_TYPE_BATTERY; smb->battery.get_property = smb347_battery_get_property; smb->battery.properties = smb347_battery_properties; smb->battery.num_properties = ARRAY_SIZE(smb347_battery_properties); ret = power_supply_register(dev, &smb->battery); if (ret < 0) { if (smb->pdata->use_usb) power_supply_unregister(&smb->usb); if (smb->pdata->use_mains) power_supply_unregister(&smb->mains); return ret; } /* * Interrupt pin is optional. If it is connected, we setup the * interrupt support here. */ if (pdata->irq_gpio >= 0) { ret = smb347_irq_init(smb); 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); } } smb->dentry = debugfs_create_file("smb347-regs", S_IRUSR, NULL, smb, &smb347_debugfs_fops); return 0; } static int smb347_remove(struct i2c_client *client) { struct smb347_charger *smb = i2c_get_clientdata(client); if (!IS_ERR_OR_NULL(smb->dentry)) debugfs_remove(smb->dentry); 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 = __devexit_p(smb347_remove), .id_table = smb347_id, }; module_i2c_driver(smb347_driver); MODULE_AUTHOR("Bruce E. Robertson "); MODULE_AUTHOR("Mika Westerberg "); MODULE_DESCRIPTION("SMB347 battery charger driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("i2c:smb347");