/* * TWL4030/TPS65950 BCI (Battery Charger Interface) driver * * Copyright (C) 2010 Gražvydas Ignotas * * based on twl4030_bci_battery.c by TI * Copyright (C) 2008 Texas Instruments, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #include #include #include #include #include #include #include #include #include #include #include #define TWL4030_BCIMSTATEC 0x02 #define TWL4030_BCIICHG 0x08 #define TWL4030_BCIVAC 0x0a #define TWL4030_BCIVBUS 0x0c #define TWL4030_BCIMFSTS3 0x0F #define TWL4030_BCIMFSTS4 0x10 #define TWL4030_BCICTL1 0x23 #define TWL4030_BB_CFG 0x12 #define TWL4030_BCIMFSTS1 0x01 #define TWL4030_BCIAUTOWEN BIT(5) #define TWL4030_CONFIG_DONE BIT(4) #define TWL4030_BCIAUTOUSB BIT(1) #define TWL4030_BCIAUTOAC BIT(0) #define TWL4030_CGAIN BIT(5) #define TWL4030_USBFASTMCHG BIT(2) #define TWL4030_STS_VBUS BIT(7) #define TWL4030_STS_USB_ID BIT(2) #define TWL4030_BBCHEN BIT(4) #define TWL4030_BBSEL_MASK 0x0c #define TWL4030_BBSEL_2V5 0x00 #define TWL4030_BBSEL_3V0 0x04 #define TWL4030_BBSEL_3V1 0x08 #define TWL4030_BBSEL_3V2 0x0c #define TWL4030_BBISEL_MASK 0x03 #define TWL4030_BBISEL_25uA 0x00 #define TWL4030_BBISEL_150uA 0x01 #define TWL4030_BBISEL_500uA 0x02 #define TWL4030_BBISEL_1000uA 0x03 #define TWL4030_BATSTSPCHG BIT(2) #define TWL4030_BATSTSMCHG BIT(6) /* BCI interrupts */ #define TWL4030_WOVF BIT(0) /* Watchdog overflow */ #define TWL4030_TMOVF BIT(1) /* Timer overflow */ #define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */ #define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */ #define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */ #define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */ #define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */ #define TWL4030_BATSTS BIT(7) /* Battery status */ #define TWL4030_VBATLVL BIT(0) /* VBAT level */ #define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */ #define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */ #define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */ #define TWL4030_MSTATEC_USB BIT(4) #define TWL4030_MSTATEC_AC BIT(5) #define TWL4030_MSTATEC_MASK 0x0f #define TWL4030_MSTATEC_QUICK1 0x02 #define TWL4030_MSTATEC_QUICK7 0x07 #define TWL4030_MSTATEC_COMPLETE1 0x0b #define TWL4030_MSTATEC_COMPLETE4 0x0e static bool allow_usb; module_param(allow_usb, bool, 0644); MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current"); struct twl4030_bci { struct device *dev; struct power_supply ac; struct power_supply usb; struct usb_phy *transceiver; struct notifier_block usb_nb; struct work_struct work; int irq_chg; int irq_bci; struct regulator *usb_reg; int usb_enabled; unsigned long event; }; /* * clear and set bits on an given register on a given module */ static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg) { u8 val = 0; int ret; ret = twl_i2c_read_u8(mod_no, &val, reg); if (ret) return ret; val &= ~clear; val |= set; return twl_i2c_write_u8(mod_no, val, reg); } static int twl4030_bci_read(u8 reg, u8 *val) { return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg); } static int twl4030_clear_set_boot_bci(u8 clear, u8 set) { return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear, TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set, TWL4030_PM_MASTER_BOOT_BCI); } static int twl4030bci_read_adc_val(u8 reg) { int ret, temp; u8 val; /* read MSB */ ret = twl4030_bci_read(reg + 1, &val); if (ret) return ret; temp = (int)(val & 0x03) << 8; /* read LSB */ ret = twl4030_bci_read(reg, &val); if (ret) return ret; return temp | val; } /* * Check if Battery Pack was present */ static int twl4030_is_battery_present(struct twl4030_bci *bci) { int ret; u8 val = 0; /* Battery presence in Main charge? */ ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, TWL4030_BCIMFSTS3); if (ret) return ret; if (val & TWL4030_BATSTSMCHG) return 0; /* * OK, It could be that bootloader did not enable main charger, * pre-charge is h/w auto. So, Battery presence in Pre-charge? */ ret = twl_i2c_read_u8(TWL4030_MODULE_PRECHARGE, &val, TWL4030_BCIMFSTS1); if (ret) return ret; if (val & TWL4030_BATSTSPCHG) return 0; return -ENODEV; } /* * Check if VBUS power is present */ static int twl4030_bci_have_vbus(struct twl4030_bci *bci) { int ret; u8 hwsts; ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &hwsts, TWL4030_PM_MASTER_STS_HW_CONDITIONS); if (ret < 0) return 0; dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts); /* in case we also have STS_USB_ID, VBUS is driven by TWL itself */ if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID)) return 1; return 0; } /* * Enable/Disable USB Charge functionality. */ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable) { int ret; if (enable) { /* Check for USB charger connected */ if (!twl4030_bci_have_vbus(bci)) return -ENODEV; /* * Until we can find out what current the device can provide, * require a module param to enable USB charging. */ if (!allow_usb) { dev_warn(bci->dev, "USB charging is disabled.\n"); return -EACCES; } /* Need to keep regulator on */ if (!bci->usb_enabled) { ret = regulator_enable(bci->usb_reg); if (ret) { dev_err(bci->dev, "Failed to enable regulator\n"); return ret; } bci->usb_enabled = 1; } /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */ ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB); if (ret < 0) return ret; /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */ ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0, TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4); } else { ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0); if (bci->usb_enabled) { regulator_disable(bci->usb_reg); bci->usb_enabled = 0; } } return ret; } /* * Enable/Disable AC Charge funtionality. */ static int twl4030_charger_enable_ac(bool enable) { int ret; if (enable) ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC); else ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0); return ret; } /* * Enable/Disable charging of Backup Battery. */ static int twl4030_charger_enable_backup(int uvolt, int uamp) { int ret; u8 flags; if (uvolt < 2500000 || uamp < 25) { /* disable charging of backup battery */ ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER, TWL4030_BBCHEN, 0, TWL4030_BB_CFG); return ret; } flags = TWL4030_BBCHEN; if (uvolt >= 3200000) flags |= TWL4030_BBSEL_3V2; else if (uvolt >= 3100000) flags |= TWL4030_BBSEL_3V1; else if (uvolt >= 3000000) flags |= TWL4030_BBSEL_3V0; else flags |= TWL4030_BBSEL_2V5; if (uamp >= 1000) flags |= TWL4030_BBISEL_1000uA; else if (uamp >= 500) flags |= TWL4030_BBISEL_500uA; else if (uamp >= 150) flags |= TWL4030_BBISEL_150uA; else flags |= TWL4030_BBISEL_25uA; ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER, TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK, flags, TWL4030_BB_CFG); return ret; } /* * TWL4030 CHG_PRES (AC charger presence) events */ static irqreturn_t twl4030_charger_interrupt(int irq, void *arg) { struct twl4030_bci *bci = arg; dev_dbg(bci->dev, "CHG_PRES irq\n"); power_supply_changed(&bci->ac); power_supply_changed(&bci->usb); return IRQ_HANDLED; } /* * TWL4030 BCI monitoring events */ static irqreturn_t twl4030_bci_interrupt(int irq, void *arg) { struct twl4030_bci *bci = arg; u8 irqs1, irqs2; int ret; ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1, TWL4030_INTERRUPTS_BCIISR1A); if (ret < 0) return IRQ_HANDLED; ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2, TWL4030_INTERRUPTS_BCIISR2A); if (ret < 0) return IRQ_HANDLED; dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1); if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) { /* charger state change, inform the core */ power_supply_changed(&bci->ac); power_supply_changed(&bci->usb); } /* various monitoring events, for now we just log them here */ if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1)) dev_warn(bci->dev, "battery temperature out of range\n"); if (irqs1 & TWL4030_BATSTS) dev_crit(bci->dev, "battery disconnected\n"); if (irqs2 & TWL4030_VBATOV) dev_crit(bci->dev, "VBAT overvoltage\n"); if (irqs2 & TWL4030_VBUSOV) dev_crit(bci->dev, "VBUS overvoltage\n"); if (irqs2 & TWL4030_ACCHGOV) dev_crit(bci->dev, "Ac charger overvoltage\n"); return IRQ_HANDLED; } static void twl4030_bci_usb_work(struct work_struct *data) { struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work); switch (bci->event) { case USB_EVENT_VBUS: case USB_EVENT_CHARGER: twl4030_charger_enable_usb(bci, true); break; case USB_EVENT_NONE: twl4030_charger_enable_usb(bci, false); break; } } static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val, void *priv) { struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb); dev_dbg(bci->dev, "OTG notify %lu\n", val); bci->event = val; schedule_work(&bci->work); return NOTIFY_OK; } /* * TI provided formulas: * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85 * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7 * Here we use integer approximation of: * CGAIN == 0: val * 1.6618 - 0.85 * CGAIN == 1: (val * 1.6618 - 0.85) * 2 */ static int twl4030_charger_get_current(void) { int curr; int ret; u8 bcictl1; curr = twl4030bci_read_adc_val(TWL4030_BCIICHG); if (curr < 0) return curr; ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1); if (ret) return ret; ret = (curr * 16618 - 850 * 10000) / 10; if (bcictl1 & TWL4030_CGAIN) ret *= 2; return ret; } /* * Returns the main charge FSM state * Or < 0 on failure. */ static int twl4030bci_state(struct twl4030_bci *bci) { int ret; u8 state; ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state); if (ret) { pr_err("twl4030_bci: error reading BCIMSTATEC\n"); return ret; } dev_dbg(bci->dev, "state: %02x\n", state); return state; } static int twl4030_bci_state_to_status(int state) { state &= TWL4030_MSTATEC_MASK; if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7) return POWER_SUPPLY_STATUS_CHARGING; else if (TWL4030_MSTATEC_COMPLETE1 <= state && state <= TWL4030_MSTATEC_COMPLETE4) return POWER_SUPPLY_STATUS_FULL; else return POWER_SUPPLY_STATUS_NOT_CHARGING; } static int twl4030_bci_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent); int is_charging; int state; int ret; state = twl4030bci_state(bci); if (state < 0) return state; if (psy->type == POWER_SUPPLY_TYPE_USB) is_charging = state & TWL4030_MSTATEC_USB; else is_charging = state & TWL4030_MSTATEC_AC; switch (psp) { case POWER_SUPPLY_PROP_STATUS: if (is_charging) val->intval = twl4030_bci_state_to_status(state); else val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; break; case POWER_SUPPLY_PROP_VOLTAGE_NOW: /* charging must be active for meaningful result */ if (!is_charging) return -ENODATA; if (psy->type == POWER_SUPPLY_TYPE_USB) { ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS); if (ret < 0) return ret; /* BCIVBUS uses ADCIN8, 7/1023 V/step */ val->intval = ret * 6843; } else { ret = twl4030bci_read_adc_val(TWL4030_BCIVAC); if (ret < 0) return ret; /* BCIVAC uses ADCIN11, 10/1023 V/step */ val->intval = ret * 9775; } break; case POWER_SUPPLY_PROP_CURRENT_NOW: if (!is_charging) return -ENODATA; /* current measurement is shared between AC and USB */ ret = twl4030_charger_get_current(); if (ret < 0) return ret; val->intval = ret; break; case POWER_SUPPLY_PROP_ONLINE: val->intval = is_charging && twl4030_bci_state_to_status(state) != POWER_SUPPLY_STATUS_NOT_CHARGING; break; default: return -EINVAL; } return 0; } static enum power_supply_property twl4030_charger_props[] = { POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_ONLINE, POWER_SUPPLY_PROP_VOLTAGE_NOW, POWER_SUPPLY_PROP_CURRENT_NOW, }; #ifdef CONFIG_OF static const struct twl4030_bci_platform_data * twl4030_bci_parse_dt(struct device *dev) { struct device_node *np = dev->of_node; struct twl4030_bci_platform_data *pdata; u32 num; if (!np) return NULL; pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return pdata; if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0) pdata->bb_uvolt = num; if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0) pdata->bb_uamp = num; return pdata; } #else static inline const struct twl4030_bci_platform_data * twl4030_bci_parse_dt(struct device *dev) { return NULL; } #endif static int __init twl4030_bci_probe(struct platform_device *pdev) { struct twl4030_bci *bci; const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data; int ret; u32 reg; bci = kzalloc(sizeof(*bci), GFP_KERNEL); if (bci == NULL) return -ENOMEM; if (!pdata) pdata = twl4030_bci_parse_dt(&pdev->dev); bci->dev = &pdev->dev; bci->irq_chg = platform_get_irq(pdev, 0); bci->irq_bci = platform_get_irq(pdev, 1); /* Only proceed further *IF* battery is physically present */ ret = twl4030_is_battery_present(bci); if (ret) { dev_crit(&pdev->dev, "Battery was not detected:%d\n", ret); goto fail_no_battery; } platform_set_drvdata(pdev, bci); bci->ac.name = "twl4030_ac"; bci->ac.type = POWER_SUPPLY_TYPE_MAINS; bci->ac.properties = twl4030_charger_props; bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props); bci->ac.get_property = twl4030_bci_get_property; ret = power_supply_register(&pdev->dev, &bci->ac); if (ret) { dev_err(&pdev->dev, "failed to register ac: %d\n", ret); goto fail_register_ac; } bci->usb.name = "twl4030_usb"; bci->usb.type = POWER_SUPPLY_TYPE_USB; bci->usb.properties = twl4030_charger_props; bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props); bci->usb.get_property = twl4030_bci_get_property; bci->usb_reg = regulator_get(bci->dev, "bci3v1"); ret = power_supply_register(&pdev->dev, &bci->usb); if (ret) { dev_err(&pdev->dev, "failed to register usb: %d\n", ret); goto fail_register_usb; } ret = request_threaded_irq(bci->irq_chg, NULL, twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name, bci); if (ret < 0) { dev_err(&pdev->dev, "could not request irq %d, status %d\n", bci->irq_chg, ret); goto fail_chg_irq; } ret = request_threaded_irq(bci->irq_bci, NULL, twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci); if (ret < 0) { dev_err(&pdev->dev, "could not request irq %d, status %d\n", bci->irq_bci, ret); goto fail_bci_irq; } INIT_WORK(&bci->work, twl4030_bci_usb_work); bci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2); if (!IS_ERR_OR_NULL(bci->transceiver)) { bci->usb_nb.notifier_call = twl4030_bci_usb_ncb; usb_register_notifier(bci->transceiver, &bci->usb_nb); } /* Enable interrupts now. */ reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 | TWL4030_TBATOR1 | TWL4030_BATSTS); ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg, TWL4030_INTERRUPTS_BCIIMR1A); if (ret < 0) { dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret); goto fail_unmask_interrupts; } reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV); ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg, TWL4030_INTERRUPTS_BCIIMR2A); if (ret < 0) dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret); twl4030_charger_enable_ac(true); twl4030_charger_enable_usb(bci, true); if (pdata) twl4030_charger_enable_backup(pdata->bb_uvolt, pdata->bb_uamp); else twl4030_charger_enable_backup(0, 0); return 0; fail_unmask_interrupts: if (!IS_ERR_OR_NULL(bci->transceiver)) { usb_unregister_notifier(bci->transceiver, &bci->usb_nb); usb_put_phy(bci->transceiver); } free_irq(bci->irq_bci, bci); fail_bci_irq: free_irq(bci->irq_chg, bci); fail_chg_irq: power_supply_unregister(&bci->usb); fail_register_usb: power_supply_unregister(&bci->ac); fail_register_ac: fail_no_battery: kfree(bci); return ret; } static int __exit twl4030_bci_remove(struct platform_device *pdev) { struct twl4030_bci *bci = platform_get_drvdata(pdev); twl4030_charger_enable_ac(false); twl4030_charger_enable_usb(bci, false); twl4030_charger_enable_backup(0, 0); /* mask interrupts */ twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff, TWL4030_INTERRUPTS_BCIIMR1A); twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff, TWL4030_INTERRUPTS_BCIIMR2A); if (!IS_ERR_OR_NULL(bci->transceiver)) { usb_unregister_notifier(bci->transceiver, &bci->usb_nb); usb_put_phy(bci->transceiver); } free_irq(bci->irq_bci, bci); free_irq(bci->irq_chg, bci); power_supply_unregister(&bci->usb); power_supply_unregister(&bci->ac); kfree(bci); return 0; } static const struct of_device_id twl_bci_of_match[] = { {.compatible = "ti,twl4030-bci", }, { } }; MODULE_DEVICE_TABLE(of, twl_bci_of_match); static struct platform_driver twl4030_bci_driver = { .driver = { .name = "twl4030_bci", .of_match_table = of_match_ptr(twl_bci_of_match), }, .remove = __exit_p(twl4030_bci_remove), }; module_platform_driver_probe(twl4030_bci_driver, twl4030_bci_probe); MODULE_AUTHOR("Gražvydas Ignotas"); MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:twl4030_bci");