diff options
Diffstat (limited to 'drivers/power/pcf50633-charger.c')
-rw-r--r-- | drivers/power/pcf50633-charger.c | 228 |
1 files changed, 153 insertions, 75 deletions
diff --git a/drivers/power/pcf50633-charger.c b/drivers/power/pcf50633-charger.c index 6a84a8eb8d7..ea3fdfaca90 100644 --- a/drivers/power/pcf50633-charger.c +++ b/drivers/power/pcf50633-charger.c @@ -29,15 +29,12 @@ struct pcf50633_mbc { struct pcf50633 *pcf; - int adapter_active; int adapter_online; - int usb_active; int usb_online; struct power_supply usb; struct power_supply adapter; - - struct delayed_work charging_restart_work; + struct power_supply ac; }; int pcf50633_mbc_usb_curlim_set(struct pcf50633 *pcf, int ma) @@ -47,16 +44,21 @@ int pcf50633_mbc_usb_curlim_set(struct pcf50633 *pcf, int ma) u8 bits; int charging_start = 1; u8 mbcs2, chgmod; + unsigned int mbcc5; - if (ma >= 1000) + if (ma >= 1000) { bits = PCF50633_MBCC7_USB_1000mA; - else if (ma >= 500) + ma = 1000; + } else if (ma >= 500) { bits = PCF50633_MBCC7_USB_500mA; - else if (ma >= 100) + ma = 500; + } else if (ma >= 100) { bits = PCF50633_MBCC7_USB_100mA; - else { + ma = 100; + } else { bits = PCF50633_MBCC7_USB_SUSPEND; charging_start = 0; + ma = 0; } ret = pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC7, @@ -66,21 +68,40 @@ int pcf50633_mbc_usb_curlim_set(struct pcf50633 *pcf, int ma) else dev_info(pcf->dev, "usb curlim to %d mA\n", ma); - /* Manual charging start */ - mbcs2 = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2); + /* + * We limit the charging current to be the USB current limit. + * The reason is that on pcf50633, when it enters PMU Standby mode, + * which it does when the device goes "off", the USB current limit + * reverts to the variant default. In at least one common case, that + * default is 500mA. By setting the charging current to be the same + * as the USB limit we set here before PMU standby, we enforce it only + * using the correct amount of current even when the USB current limit + * gets reset to the wrong thing + */ + + if (mbc->pcf->pdata->charger_reference_current_ma) { + mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma; + if (mbcc5 > 255) + mbcc5 = 255; + pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5); + } + + mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2); chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK); /* If chgmod == BATFULL, setting chgena has no effect. - * We need to set resume instead. + * Datasheet says we need to set resume instead but when autoresume is + * used resume doesn't work. Clear and set chgena instead. */ if (chgmod != PCF50633_MBCS2_MBC_BAT_FULL) pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1, PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA); - else + else { + pcf50633_reg_clear_bits(pcf, PCF50633_REG_MBCC1, + PCF50633_MBCC1_CHGENA); pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1, - PCF50633_MBCC1_RESUME, PCF50633_MBCC1_RESUME); - - mbc->usb_active = charging_start; + PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA); + } power_supply_changed(&mbc->usb); @@ -92,20 +113,44 @@ int pcf50633_mbc_get_status(struct pcf50633 *pcf) { struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev); int status = 0; + u8 chgmod; + + if (!mbc) + return 0; + + chgmod = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2) + & PCF50633_MBCS2_MBC_MASK; if (mbc->usb_online) status |= PCF50633_MBC_USB_ONLINE; - if (mbc->usb_active) + if (chgmod == PCF50633_MBCS2_MBC_USB_PRE || + chgmod == PCF50633_MBCS2_MBC_USB_PRE_WAIT || + chgmod == PCF50633_MBCS2_MBC_USB_FAST || + chgmod == PCF50633_MBCS2_MBC_USB_FAST_WAIT) status |= PCF50633_MBC_USB_ACTIVE; if (mbc->adapter_online) status |= PCF50633_MBC_ADAPTER_ONLINE; - if (mbc->adapter_active) + if (chgmod == PCF50633_MBCS2_MBC_ADP_PRE || + chgmod == PCF50633_MBCS2_MBC_ADP_PRE_WAIT || + chgmod == PCF50633_MBCS2_MBC_ADP_FAST || + chgmod == PCF50633_MBCS2_MBC_ADP_FAST_WAIT) status |= PCF50633_MBC_ADAPTER_ACTIVE; return status; } EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status); +int pcf50633_mbc_get_usb_online_status(struct pcf50633 *pcf) +{ + struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev); + + if (!mbc) + return 0; + + return mbc->usb_online; +} +EXPORT_SYMBOL_GPL(pcf50633_mbc_get_usb_online_status); + static ssize_t show_chgmode(struct device *dev, struct device_attribute *attr, char *buf) { @@ -156,9 +201,55 @@ static ssize_t set_usblim(struct device *dev, static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim); +static ssize_t +show_chglim(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct pcf50633_mbc *mbc = dev_get_drvdata(dev); + u8 mbcc5 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC5); + unsigned int ma; + + if (!mbc->pcf->pdata->charger_reference_current_ma) + return -ENODEV; + + ma = (mbc->pcf->pdata->charger_reference_current_ma * mbcc5) >> 8; + + return sprintf(buf, "%u\n", ma); +} + +static ssize_t set_chglim(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct pcf50633_mbc *mbc = dev_get_drvdata(dev); + unsigned long ma; + unsigned int mbcc5; + int ret; + + if (!mbc->pcf->pdata->charger_reference_current_ma) + return -ENODEV; + + ret = strict_strtoul(buf, 10, &ma); + if (ret) + return -EINVAL; + + mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma; + if (mbcc5 > 255) + mbcc5 = 255; + pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5); + + return count; +} + +/* + * This attribute allows to change MBC charging limit on the fly + * independently of usb current limit. It also gets set automatically every + * time usb current limit is changed. + */ +static DEVICE_ATTR(chg_curlim, S_IRUGO | S_IWUSR, show_chglim, set_chglim); + static struct attribute *pcf50633_mbc_sysfs_entries[] = { &dev_attr_chgmode.attr, &dev_attr_usb_curlim.attr, + &dev_attr_chg_curlim.attr, NULL, }; @@ -167,76 +258,26 @@ static struct attribute_group mbc_attr_group = { .attrs = pcf50633_mbc_sysfs_entries, }; -/* MBC state machine switches into charging mode when the battery voltage - * falls below 96% of a battery float voltage. But the voltage drop in Li-ion - * batteries is marginal(1~2 %) till about 80% of its capacity - which means, - * after a BATFULL, charging won't be restarted until 80%. - * - * This work_struct function restarts charging at regular intervals to make - * sure we don't discharge too much - */ - -static void pcf50633_mbc_charging_restart(struct work_struct *work) -{ - struct pcf50633_mbc *mbc; - u8 mbcs2, chgmod; - - mbc = container_of(work, struct pcf50633_mbc, - charging_restart_work.work); - - mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2); - chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK); - - if (chgmod != PCF50633_MBCS2_MBC_BAT_FULL) - return; - - /* Restart charging */ - pcf50633_reg_set_bit_mask(mbc->pcf, PCF50633_REG_MBCC1, - PCF50633_MBCC1_RESUME, PCF50633_MBCC1_RESUME); - mbc->usb_active = 1; - power_supply_changed(&mbc->usb); - - dev_info(mbc->pcf->dev, "Charging restarted\n"); -} - static void pcf50633_mbc_irq_handler(int irq, void *data) { struct pcf50633_mbc *mbc = data; - int chg_restart_interval = - mbc->pcf->pdata->charging_restart_interval; /* USB */ if (irq == PCF50633_IRQ_USBINS) { mbc->usb_online = 1; } else if (irq == PCF50633_IRQ_USBREM) { mbc->usb_online = 0; - mbc->usb_active = 0; pcf50633_mbc_usb_curlim_set(mbc->pcf, 0); - cancel_delayed_work_sync(&mbc->charging_restart_work); } /* Adapter */ - if (irq == PCF50633_IRQ_ADPINS) { + if (irq == PCF50633_IRQ_ADPINS) mbc->adapter_online = 1; - mbc->adapter_active = 1; - } else if (irq == PCF50633_IRQ_ADPREM) { + else if (irq == PCF50633_IRQ_ADPREM) mbc->adapter_online = 0; - mbc->adapter_active = 0; - } - - if (irq == PCF50633_IRQ_BATFULL) { - mbc->usb_active = 0; - mbc->adapter_active = 0; - - if (chg_restart_interval > 0) - schedule_delayed_work(&mbc->charging_restart_work, - chg_restart_interval); - } else if (irq == PCF50633_IRQ_USBLIMON) - mbc->usb_active = 0; - else if (irq == PCF50633_IRQ_USBLIMOFF) - mbc->usb_active = 1; + power_supply_changed(&mbc->ac); power_supply_changed(&mbc->usb); power_supply_changed(&mbc->adapter); @@ -269,10 +310,34 @@ static int usb_get_property(struct power_supply *psy, { struct pcf50633_mbc *mbc = container_of(psy, struct pcf50633_mbc, usb); int ret = 0; + u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) & + PCF50633_MBCC7_USB_MASK; switch (psp) { case POWER_SUPPLY_PROP_ONLINE: - val->intval = mbc->usb_online; + val->intval = mbc->usb_online && + (usblim <= PCF50633_MBCC7_USB_500mA); + break; + default: + ret = -EINVAL; + break; + } + return ret; +} + +static int ac_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct pcf50633_mbc *mbc = container_of(psy, struct pcf50633_mbc, ac); + int ret = 0; + u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) & + PCF50633_MBCC7_USB_MASK; + + switch (psp) { + case POWER_SUPPLY_PROP_ONLINE: + val->intval = mbc->usb_online && + (usblim == PCF50633_MBCC7_USB_1000mA); break; default: ret = -EINVAL; @@ -336,6 +401,14 @@ static int __devinit pcf50633_mbc_probe(struct platform_device *pdev) mbc->usb.supplied_to = mbc->pcf->pdata->batteries; mbc->usb.num_supplicants = mbc->pcf->pdata->num_batteries; + mbc->ac.name = "ac"; + mbc->ac.type = POWER_SUPPLY_TYPE_MAINS; + mbc->ac.properties = power_props; + mbc->ac.num_properties = ARRAY_SIZE(power_props); + mbc->ac.get_property = ac_get_property; + mbc->ac.supplied_to = mbc->pcf->pdata->batteries; + mbc->ac.num_supplicants = mbc->pcf->pdata->num_batteries; + ret = power_supply_register(&pdev->dev, &mbc->adapter); if (ret) { dev_err(mbc->pcf->dev, "failed to register adapter\n"); @@ -351,8 +424,14 @@ static int __devinit pcf50633_mbc_probe(struct platform_device *pdev) return ret; } - INIT_DELAYED_WORK(&mbc->charging_restart_work, - pcf50633_mbc_charging_restart); + ret = power_supply_register(&pdev->dev, &mbc->ac); + if (ret) { + dev_err(mbc->pcf->dev, "failed to register ac\n"); + power_supply_unregister(&mbc->adapter); + power_supply_unregister(&mbc->usb); + kfree(mbc); + return ret; + } ret = sysfs_create_group(&pdev->dev.kobj, &mbc_attr_group); if (ret) @@ -378,8 +457,7 @@ static int __devexit pcf50633_mbc_remove(struct platform_device *pdev) power_supply_unregister(&mbc->usb); power_supply_unregister(&mbc->adapter); - - cancel_delayed_work_sync(&mbc->charging_restart_work); + power_supply_unregister(&mbc->ac); kfree(mbc); |