/* * 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_BCIMDEN 0x00 #define TWL4030_BCIMDKEY 0x01 #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_BCIIREF1 0x27 #define TWL4030_BCIIREF2 0x28 #define TWL4030_BCIMFKEY 0x11 #define TWL4030_BCIMFEN3 0x14 #define TWL4030_BCIMFTH8 0x1d #define TWL4030_BCIMFTH9 0x1e #define TWL4030_BCIWDKEY 0x21 #define TWL4030_BCIMFSTS1 0x01 #define TWL4030_BCIAUTOWEN BIT(5) #define TWL4030_CONFIG_DONE BIT(4) #define TWL4030_CVENAC BIT(2) #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 /* * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11) * then AC is available. */ static inline int ac_available(struct iio_channel *channel_vac) { int val, err; if (!channel_vac) return 0; err = iio_read_channel_processed(channel_vac, &val); if (err < 0) return 0; return val > 4500; } 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; int usb_enabled; /* * ichg_* and *_cur values in uA. If any are 'large', we set * CGAIN to '1' which doubles the range for half the * precision. */ unsigned int ichg_eoc, ichg_lo, ichg_hi; unsigned int usb_cur, ac_cur; struct iio_channel *channel_vac; bool ac_is_active; int usb_mode, ac_mode; /* charging mode requested */ #define CHARGE_OFF 0 #define CHARGE_AUTO 1 #define CHARGE_LINEAR 2 /* When setting the USB current we slowly increase the * requested current until target is reached or the voltage * drops below 4.75V. In the latter case we step back one * step. */ unsigned int usb_cur_target; struct delayed_work current_worker; #define USB_CUR_STEP 20000 /* 20mA at a time */ #define USB_MIN_VOLT 4750000 /* 4.75V */ #define USB_CUR_DELAY msecs_to_jiffies(100) #define USB_MAX_CURRENT 1700000 /* TWL4030 caps at 1.7A */ unsigned long event; }; /* strings for 'usb_mode' values */ static char *modes[] = { "off", "auto", "continuous" }; /* * 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; } /* * 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 * 1000 * CGAIN == 1: (val * 1.6618 - 0.85 * 1000) * 2 */ /* * convert twl register value for currents into uA */ static int regval2ua(int regval, bool cgain) { if (cgain) return (regval * 16618 - 8500 * 1000) / 5; else return (regval * 16618 - 8500 * 1000) / 10; } /* * convert uA currents into twl register value */ static int ua2regval(int ua, bool cgain) { int ret; if (cgain) ua /= 2; ret = (ua * 10 + 8500 * 1000) / 16618; /* rounding problems */ if (ret < 512) ret = 512; return ret; } static int twl4030_charger_update_current(struct twl4030_bci *bci) { int status; int cur; unsigned reg, cur_reg; u8 bcictl1, oldreg, fullreg; bool cgain = false; u8 boot_bci; /* * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11) * and AC is enabled, set current for 'ac' */ if (ac_available(bci->channel_vac)) { cur = bci->ac_cur; bci->ac_is_active = true; } else { cur = bci->usb_cur; bci->ac_is_active = false; if (cur > bci->usb_cur_target) { cur = bci->usb_cur_target; bci->usb_cur = cur; } if (cur < bci->usb_cur_target) schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY); } /* First, check thresholds and see if cgain is needed */ if (bci->ichg_eoc >= 200000) cgain = true; if (bci->ichg_lo >= 400000) cgain = true; if (bci->ichg_hi >= 820000) cgain = true; if (cur > 852000) cgain = true; status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1); if (status < 0) return status; if (twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &boot_bci, TWL4030_PM_MASTER_BOOT_BCI) < 0) boot_bci = 0; boot_bci &= 7; if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) /* Need to turn for charging while we change the * CGAIN bit. Leave it off while everything is * updated. */ twl4030_clear_set_boot_bci(boot_bci, 0); /* * For ichg_eoc, the hardware only supports reg values matching * 100XXXX000, and requires the XXXX be stored in the high nibble * of TWL4030_BCIMFTH8. */ reg = ua2regval(bci->ichg_eoc, cgain); if (reg > 0x278) reg = 0x278; if (reg < 0x200) reg = 0x200; reg = (reg >> 3) & 0xf; fullreg = reg << 4; /* * For ichg_lo, reg value must match 10XXXX0000. * XXXX is stored in low nibble of TWL4030_BCIMFTH8. */ reg = ua2regval(bci->ichg_lo, cgain); if (reg > 0x2F0) reg = 0x2F0; if (reg < 0x200) reg = 0x200; reg = (reg >> 4) & 0xf; fullreg |= reg; /* ichg_eoc and ichg_lo live in same register */ status = twl4030_bci_read(TWL4030_BCIMFTH8, &oldreg); if (status < 0) return status; if (oldreg != fullreg) { status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xF4, TWL4030_BCIMFKEY); if (status < 0) return status; twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, fullreg, TWL4030_BCIMFTH8); } /* ichg_hi threshold must be 1XXXX01100 (I think) */ reg = ua2regval(bci->ichg_hi, cgain); if (reg > 0x3E0) reg = 0x3E0; if (reg < 0x200) reg = 0x200; fullreg = (reg >> 5) & 0xF; fullreg <<= 4; status = twl4030_bci_read(TWL4030_BCIMFTH9, &oldreg); if (status < 0) return status; if ((oldreg & 0xF0) != fullreg) { fullreg |= (oldreg & 0x0F); status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7, TWL4030_BCIMFKEY); if (status < 0) return status; twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, fullreg, TWL4030_BCIMFTH9); } /* * And finally, set the current. This is stored in * two registers. */ reg = ua2regval(cur, cgain); /* we have only 10 bits */ if (reg > 0x3ff) reg = 0x3ff; status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg); if (status < 0) return status; cur_reg = oldreg; status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg); if (status < 0) return status; cur_reg |= oldreg << 8; if (reg != oldreg) { /* disable write protection for one write access for * BCIIREF */ status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7, TWL4030_BCIMFKEY); if (status < 0) return status; status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, (reg & 0x100) ? 3 : 2, TWL4030_BCIIREF2); if (status < 0) return status; /* disable write protection for one write access for * BCIIREF */ status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7, TWL4030_BCIMFKEY); if (status < 0) return status; status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, reg & 0xff, TWL4030_BCIIREF1); } if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) { /* Flip CGAIN and re-enable charging */ bcictl1 ^= TWL4030_CGAIN; twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, bcictl1, TWL4030_BCICTL1); twl4030_clear_set_boot_bci(0, boot_bci); } return 0; } static int twl4030_charger_get_current(void); static void twl4030_current_worker(struct work_struct *data) { int v, curr; int res; struct twl4030_bci *bci = container_of(data, struct twl4030_bci, current_worker.work); res = twl4030bci_read_adc_val(TWL4030_BCIVBUS); if (res < 0) v = 0; else /* BCIVBUS uses ADCIN8, 7/1023 V/step */ v = res * 6843; curr = twl4030_charger_get_current(); dev_dbg(bci->dev, "v=%d cur=%d limit=%d target=%d\n", v, curr, bci->usb_cur, bci->usb_cur_target); if (v < USB_MIN_VOLT) { /* Back up and stop adjusting. */ bci->usb_cur -= USB_CUR_STEP; bci->usb_cur_target = bci->usb_cur; } else if (bci->usb_cur >= bci->usb_cur_target || bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) { /* Reached target and voltage is OK - stop */ return; } else { bci->usb_cur += USB_CUR_STEP; schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY); } twl4030_charger_update_current(bci); } /* * Enable/Disable USB Charge functionality. */ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable) { int ret; if (bci->usb_mode == CHARGE_OFF) enable = false; if (enable && !IS_ERR_OR_NULL(bci->transceiver)) { twl4030_charger_update_current(bci); /* Need to keep phy powered */ if (!bci->usb_enabled) { pm_runtime_get_sync(bci->transceiver->dev); bci->usb_enabled = 1; } if (bci->usb_mode == CHARGE_AUTO) /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */ ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB); /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */ ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0, TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4); if (bci->usb_mode == CHARGE_LINEAR) { twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC|TWL4030_CVENAC, 0); /* Watch dog key: WOVF acknowledge */ ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x33, TWL4030_BCIWDKEY); /* 0x24 + EKEY6: off mode */ ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a, TWL4030_BCIMDKEY); /* EKEY2: Linear charge: USB path */ ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x26, TWL4030_BCIMDKEY); /* WDKEY5: stop watchdog count */ ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf3, TWL4030_BCIWDKEY); /* enable MFEN3 access */ ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x9c, TWL4030_BCIMFKEY); /* ICHGEOCEN - end-of-charge monitor (current < 80mA) * (charging continues) * ICHGLOWEN - current level monitor (charge continues) * don't monitor over-current or heat save */ ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf0, TWL4030_BCIMFEN3); } } else { ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0); ret |= twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a, TWL4030_BCIMDKEY); if (bci->usb_enabled) { pm_runtime_mark_last_busy(bci->transceiver->dev); pm_runtime_put_autosuspend(bci->transceiver->dev); bci->usb_enabled = 0; } bci->usb_cur = 0; } return ret; } /* * Enable/Disable AC Charge funtionality. */ static int twl4030_charger_enable_ac(struct twl4030_bci *bci, bool enable) { int ret; if (bci->ac_mode == CHARGE_OFF) enable = false; 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"); /* reset current on each 'plug' event */ bci->ac_cur = 500000; twl4030_charger_update_current(bci); 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); } twl4030_charger_update_current(bci); /* 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; } /* * Provide "max_current" attribute in sysfs. */ static ssize_t twl4030_bci_max_current_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) { struct twl4030_bci *bci = dev_get_drvdata(dev->parent); int cur = 0; int status = 0; status = kstrtoint(buf, 10, &cur); if (status) return status; if (cur < 0) return -EINVAL; if (dev == &bci->ac->dev) bci->ac_cur = cur; else bci->usb_cur_target = cur; twl4030_charger_update_current(bci); return n; } /* * sysfs max_current show */ static ssize_t twl4030_bci_max_current_show(struct device *dev, struct device_attribute *attr, char *buf) { int status = 0; int cur = -1; u8 bcictl1; struct twl4030_bci *bci = dev_get_drvdata(dev->parent); if (dev == &bci->ac->dev) { if (!bci->ac_is_active) cur = bci->ac_cur; } else { if (bci->ac_is_active) cur = bci->usb_cur_target; } if (cur < 0) { cur = twl4030bci_read_adc_val(TWL4030_BCIIREF1); if (cur < 0) return cur; status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1); if (status < 0) return status; cur = regval2ua(cur, bcictl1 & TWL4030_CGAIN); } return scnprintf(buf, PAGE_SIZE, "%u\n", cur); } static DEVICE_ATTR(max_current, 0644, twl4030_bci_max_current_show, twl4030_bci_max_current_store); 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); /* reset current on each 'plug' event */ if (allow_usb) bci->usb_cur_target = 500000; else bci->usb_cur_target = 100000; bci->event = val; schedule_work(&bci->work); return NOTIFY_OK; } /* * sysfs charger enabled store */ static ssize_t twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) { struct twl4030_bci *bci = dev_get_drvdata(dev->parent); int mode; int status; if (sysfs_streq(buf, modes[0])) mode = 0; else if (sysfs_streq(buf, modes[1])) mode = 1; else if (sysfs_streq(buf, modes[2])) mode = 2; else return -EINVAL; if (dev == &bci->ac->dev) { if (mode == 2) return -EINVAL; twl4030_charger_enable_ac(bci, false); bci->ac_mode = mode; status = twl4030_charger_enable_ac(bci, true); } else { twl4030_charger_enable_usb(bci, false); bci->usb_mode = mode; status = twl4030_charger_enable_usb(bci, true); } return (status == 0) ? n : status; } /* * sysfs charger enabled show */ static ssize_t twl4030_bci_mode_show(struct device *dev, struct device_attribute *attr, char *buf) { struct twl4030_bci *bci = dev_get_drvdata(dev->parent); int len = 0; int i; int mode = bci->usb_mode; if (dev == &bci->ac->dev) mode = bci->ac_mode; for (i = 0; i < ARRAY_SIZE(modes); i++) if (mode == i) len += snprintf(buf+len, PAGE_SIZE-len, "[%s] ", modes[i]); else len += snprintf(buf+len, PAGE_SIZE-len, "%s ", modes[i]); buf[len-1] = '\n'; return len; } static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show, twl4030_bci_mode_store); 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; return regval2ua(curr, bcictl1 & TWL4030_CGAIN); } /* * 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->desc->type == POWER_SUPPLY_TYPE_USB) is_charging = state & TWL4030_MSTATEC_USB; else is_charging = state & TWL4030_MSTATEC_AC; if (!is_charging) { u8 s; twl4030_bci_read(TWL4030_BCIMDEN, &s); if (psy->desc->type == POWER_SUPPLY_TYPE_USB) is_charging = s & 1; else is_charging = s & 2; if (is_charging) /* A little white lie */ state = TWL4030_MSTATEC_QUICK1; } 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->desc->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 const struct power_supply_desc twl4030_bci_ac_desc = { .name = "twl4030_ac", .type = POWER_SUPPLY_TYPE_MAINS, .properties = twl4030_charger_props, .num_properties = ARRAY_SIZE(twl4030_charger_props), .get_property = twl4030_bci_get_property, }; static const struct power_supply_desc twl4030_bci_usb_desc = { .name = "twl4030_usb", .type = POWER_SUPPLY_TYPE_USB, .properties = twl4030_charger_props, .num_properties = ARRAY_SIZE(twl4030_charger_props), .get_property = twl4030_bci_get_property, }; static int 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 = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL); if (bci == NULL) return -ENOMEM; if (!pdata) pdata = twl4030_bci_parse_dt(&pdev->dev); bci->ichg_eoc = 80100; /* Stop charging when current drops to here */ bci->ichg_lo = 241000; /* Low threshold */ bci->ichg_hi = 500000; /* High threshold */ bci->ac_cur = 500000; /* 500mA */ if (allow_usb) bci->usb_cur_target = 500000; /* 500mA */ else bci->usb_cur_target = 100000; /* 100mA */ bci->usb_mode = CHARGE_AUTO; bci->ac_mode = CHARGE_AUTO; 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); return ret; } platform_set_drvdata(pdev, bci); bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc, NULL); if (IS_ERR(bci->ac)) { ret = PTR_ERR(bci->ac); dev_err(&pdev->dev, "failed to register ac: %d\n", ret); return ret; } bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc, NULL); if (IS_ERR(bci->usb)) { ret = PTR_ERR(bci->usb); dev_err(&pdev->dev, "failed to register usb: %d\n", ret); return ret; } ret = devm_request_threaded_irq(&pdev->dev, 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); return ret; } ret = devm_request_threaded_irq(&pdev->dev, 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); return ret; } bci->channel_vac = iio_channel_get(&pdev->dev, "vac"); if (IS_ERR(bci->channel_vac)) { bci->channel_vac = NULL; dev_warn(&pdev->dev, "could not request vac iio channel"); } INIT_WORK(&bci->work, twl4030_bci_usb_work); INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker); bci->usb_nb.notifier_call = twl4030_bci_usb_ncb; if (bci->dev->of_node) { struct device_node *phynode; phynode = of_find_compatible_node(bci->dev->of_node->parent, NULL, "ti,twl4030-usb"); if (phynode) bci->transceiver = devm_usb_get_phy_by_node( bci->dev, phynode, &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; } 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_update_current(bci); if (device_create_file(&bci->usb->dev, &dev_attr_max_current)) dev_warn(&pdev->dev, "could not create sysfs file\n"); if (device_create_file(&bci->usb->dev, &dev_attr_mode)) dev_warn(&pdev->dev, "could not create sysfs file\n"); if (device_create_file(&bci->ac->dev, &dev_attr_mode)) dev_warn(&pdev->dev, "could not create sysfs file\n"); if (device_create_file(&bci->ac->dev, &dev_attr_max_current)) dev_warn(&pdev->dev, "could not create sysfs file\n"); twl4030_charger_enable_ac(bci, true); if (!IS_ERR_OR_NULL(bci->transceiver)) twl4030_bci_usb_ncb(&bci->usb_nb, bci->transceiver->last_event, NULL); else twl4030_charger_enable_usb(bci, false); if (pdata) twl4030_charger_enable_backup(pdata->bb_uvolt, pdata->bb_uamp); else twl4030_charger_enable_backup(0, 0); return 0; fail: iio_channel_release(bci->channel_vac); return ret; } static int __exit twl4030_bci_remove(struct platform_device *pdev) { struct twl4030_bci *bci = platform_get_drvdata(pdev); twl4030_charger_enable_ac(bci, false); twl4030_charger_enable_usb(bci, false); twl4030_charger_enable_backup(0, 0); iio_channel_release(bci->channel_vac); device_remove_file(&bci->usb->dev, &dev_attr_max_current); device_remove_file(&bci->usb->dev, &dev_attr_mode); device_remove_file(&bci->ac->dev, &dev_attr_max_current); device_remove_file(&bci->ac->dev, &dev_attr_mode); /* mask interrupts */ twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff, TWL4030_INTERRUPTS_BCIIMR1A); twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff, TWL4030_INTERRUPTS_BCIIMR2A); 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 = { .probe = twl4030_bci_probe, .driver = { .name = "twl4030_bci", .of_match_table = of_match_ptr(twl_bci_of_match), }, .remove = __exit_p(twl4030_bci_remove), }; module_platform_driver(twl4030_bci_driver); MODULE_AUTHOR("Gražvydas Ignotas"); MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:twl4030_bci");