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1// SPDX-License-Identifier: GPL-2.0-or-later2/* NXP PCF50633 Main Battery Charger Driver3 *4 * (C) 2006-2008 by Openmoko, Inc.5 * Author: Balaji Rao <balajirrao@openmoko.org>6 * All rights reserved.7 *8 * Broken down from monstrous PCF50633 driver mainly by9 * Harald Welte, Andy Green and Werner Almesberger10 */11 12#include <linux/kernel.h>13#include <linux/module.h>14#include <linux/slab.h>15#include <linux/init.h>16#include <linux/types.h>17#include <linux/device.h>18#include <linux/sysfs.h>19#include <linux/platform_device.h>20#include <linux/power_supply.h>21 22#include <linux/mfd/pcf50633/core.h>23#include <linux/mfd/pcf50633/mbc.h>24 25struct pcf50633_mbc {26 struct pcf50633 *pcf;27 28 int adapter_online;29 int usb_online;30 31 struct power_supply *usb;32 struct power_supply *adapter;33 struct power_supply *ac;34};35 36int pcf50633_mbc_usb_curlim_set(struct pcf50633 *pcf, int ma)37{38 struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);39 int ret = 0;40 u8 bits;41 u8 mbcs2, chgmod;42 unsigned int mbcc5;43 44 if (ma >= 1000) {45 bits = PCF50633_MBCC7_USB_1000mA;46 ma = 1000;47 } else if (ma >= 500) {48 bits = PCF50633_MBCC7_USB_500mA;49 ma = 500;50 } else if (ma >= 100) {51 bits = PCF50633_MBCC7_USB_100mA;52 ma = 100;53 } else {54 bits = PCF50633_MBCC7_USB_SUSPEND;55 ma = 0;56 }57 58 ret = pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC7,59 PCF50633_MBCC7_USB_MASK, bits);60 if (ret)61 dev_err(pcf->dev, "error setting usb curlim to %d mA\n", ma);62 else63 dev_info(pcf->dev, "usb curlim to %d mA\n", ma);64 65 /*66 * We limit the charging current to be the USB current limit.67 * The reason is that on pcf50633, when it enters PMU Standby mode,68 * which it does when the device goes "off", the USB current limit69 * reverts to the variant default. In at least one common case, that70 * default is 500mA. By setting the charging current to be the same71 * as the USB limit we set here before PMU standby, we enforce it only72 * using the correct amount of current even when the USB current limit73 * gets reset to the wrong thing74 */75 76 if (mbc->pcf->pdata->charger_reference_current_ma) {77 mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;78 if (mbcc5 > 255)79 mbcc5 = 255;80 pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);81 }82 83 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);84 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);85 86 /* If chgmod == BATFULL, setting chgena has no effect.87 * Datasheet says we need to set resume instead but when autoresume is88 * used resume doesn't work. Clear and set chgena instead.89 */90 if (chgmod != PCF50633_MBCS2_MBC_BAT_FULL)91 pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,92 PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);93 else {94 pcf50633_reg_clear_bits(pcf, PCF50633_REG_MBCC1,95 PCF50633_MBCC1_CHGENA);96 pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,97 PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);98 }99 100 power_supply_changed(mbc->usb);101 102 return ret;103}104EXPORT_SYMBOL_GPL(pcf50633_mbc_usb_curlim_set);105 106int pcf50633_mbc_get_status(struct pcf50633 *pcf)107{108 struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);109 int status = 0;110 u8 chgmod;111 112 if (!mbc)113 return 0;114 115 chgmod = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2)116 & PCF50633_MBCS2_MBC_MASK;117 118 if (mbc->usb_online)119 status |= PCF50633_MBC_USB_ONLINE;120 if (chgmod == PCF50633_MBCS2_MBC_USB_PRE ||121 chgmod == PCF50633_MBCS2_MBC_USB_PRE_WAIT ||122 chgmod == PCF50633_MBCS2_MBC_USB_FAST ||123 chgmod == PCF50633_MBCS2_MBC_USB_FAST_WAIT)124 status |= PCF50633_MBC_USB_ACTIVE;125 if (mbc->adapter_online)126 status |= PCF50633_MBC_ADAPTER_ONLINE;127 if (chgmod == PCF50633_MBCS2_MBC_ADP_PRE ||128 chgmod == PCF50633_MBCS2_MBC_ADP_PRE_WAIT ||129 chgmod == PCF50633_MBCS2_MBC_ADP_FAST ||130 chgmod == PCF50633_MBCS2_MBC_ADP_FAST_WAIT)131 status |= PCF50633_MBC_ADAPTER_ACTIVE;132 133 return status;134}135EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status);136 137int pcf50633_mbc_get_usb_online_status(struct pcf50633 *pcf)138{139 struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);140 141 if (!mbc)142 return 0;143 144 return mbc->usb_online;145}146EXPORT_SYMBOL_GPL(pcf50633_mbc_get_usb_online_status);147 148static ssize_t149show_chgmode(struct device *dev, struct device_attribute *attr, char *buf)150{151 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);152 153 u8 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);154 u8 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);155 156 return sysfs_emit(buf, "%d\n", chgmod);157}158static DEVICE_ATTR(chgmode, S_IRUGO, show_chgmode, NULL);159 160static ssize_t161show_usblim(struct device *dev, struct device_attribute *attr, char *buf)162{163 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);164 u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &165 PCF50633_MBCC7_USB_MASK;166 unsigned int ma;167 168 if (usblim == PCF50633_MBCC7_USB_1000mA)169 ma = 1000;170 else if (usblim == PCF50633_MBCC7_USB_500mA)171 ma = 500;172 else if (usblim == PCF50633_MBCC7_USB_100mA)173 ma = 100;174 else175 ma = 0;176 177 return sysfs_emit(buf, "%u\n", ma);178}179 180static ssize_t set_usblim(struct device *dev,181 struct device_attribute *attr, const char *buf, size_t count)182{183 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);184 unsigned long ma;185 int ret;186 187 ret = kstrtoul(buf, 10, &ma);188 if (ret)189 return ret;190 191 pcf50633_mbc_usb_curlim_set(mbc->pcf, ma);192 193 return count;194}195 196static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim);197 198static ssize_t199show_chglim(struct device *dev, struct device_attribute *attr, char *buf)200{201 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);202 u8 mbcc5 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC5);203 unsigned int ma;204 205 if (!mbc->pcf->pdata->charger_reference_current_ma)206 return -ENODEV;207 208 ma = (mbc->pcf->pdata->charger_reference_current_ma * mbcc5) >> 8;209 210 return sysfs_emit(buf, "%u\n", ma);211}212 213static ssize_t set_chglim(struct device *dev,214 struct device_attribute *attr, const char *buf, size_t count)215{216 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);217 unsigned long ma;218 unsigned int mbcc5;219 int ret;220 221 if (!mbc->pcf->pdata->charger_reference_current_ma)222 return -ENODEV;223 224 ret = kstrtoul(buf, 10, &ma);225 if (ret)226 return ret;227 228 mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;229 if (mbcc5 > 255)230 mbcc5 = 255;231 pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);232 233 return count;234}235 236/*237 * This attribute allows to change MBC charging limit on the fly238 * independently of usb current limit. It also gets set automatically every239 * time usb current limit is changed.240 */241static DEVICE_ATTR(chg_curlim, S_IRUGO | S_IWUSR, show_chglim, set_chglim);242 243static struct attribute *pcf50633_mbc_sysfs_attrs[] = {244 &dev_attr_chgmode.attr,245 &dev_attr_usb_curlim.attr,246 &dev_attr_chg_curlim.attr,247 NULL,248};249 250ATTRIBUTE_GROUPS(pcf50633_mbc_sysfs);251 252static void253pcf50633_mbc_irq_handler(int irq, void *data)254{255 struct pcf50633_mbc *mbc = data;256 257 /* USB */258 if (irq == PCF50633_IRQ_USBINS) {259 mbc->usb_online = 1;260 } else if (irq == PCF50633_IRQ_USBREM) {261 mbc->usb_online = 0;262 pcf50633_mbc_usb_curlim_set(mbc->pcf, 0);263 }264 265 /* Adapter */266 if (irq == PCF50633_IRQ_ADPINS)267 mbc->adapter_online = 1;268 else if (irq == PCF50633_IRQ_ADPREM)269 mbc->adapter_online = 0;270 271 power_supply_changed(mbc->ac);272 power_supply_changed(mbc->usb);273 power_supply_changed(mbc->adapter);274 275 if (mbc->pcf->pdata->mbc_event_callback)276 mbc->pcf->pdata->mbc_event_callback(mbc->pcf, irq);277}278 279static int adapter_get_property(struct power_supply *psy,280 enum power_supply_property psp,281 union power_supply_propval *val)282{283 struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);284 int ret = 0;285 286 switch (psp) {287 case POWER_SUPPLY_PROP_ONLINE:288 val->intval = mbc->adapter_online;289 break;290 default:291 ret = -EINVAL;292 break;293 }294 return ret;295}296 297static int usb_get_property(struct power_supply *psy,298 enum power_supply_property psp,299 union power_supply_propval *val)300{301 struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);302 int ret = 0;303 u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &304 PCF50633_MBCC7_USB_MASK;305 306 switch (psp) {307 case POWER_SUPPLY_PROP_ONLINE:308 val->intval = mbc->usb_online &&309 (usblim <= PCF50633_MBCC7_USB_500mA);310 break;311 default:312 ret = -EINVAL;313 break;314 }315 return ret;316}317 318static int ac_get_property(struct power_supply *psy,319 enum power_supply_property psp,320 union power_supply_propval *val)321{322 struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);323 int ret = 0;324 u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &325 PCF50633_MBCC7_USB_MASK;326 327 switch (psp) {328 case POWER_SUPPLY_PROP_ONLINE:329 val->intval = mbc->usb_online &&330 (usblim == PCF50633_MBCC7_USB_1000mA);331 break;332 default:333 ret = -EINVAL;334 break;335 }336 return ret;337}338 339static enum power_supply_property power_props[] = {340 POWER_SUPPLY_PROP_ONLINE,341};342 343static const u8 mbc_irq_handlers[] = {344 PCF50633_IRQ_ADPINS,345 PCF50633_IRQ_ADPREM,346 PCF50633_IRQ_USBINS,347 PCF50633_IRQ_USBREM,348 PCF50633_IRQ_BATFULL,349 PCF50633_IRQ_CHGHALT,350 PCF50633_IRQ_THLIMON,351 PCF50633_IRQ_THLIMOFF,352 PCF50633_IRQ_USBLIMON,353 PCF50633_IRQ_USBLIMOFF,354 PCF50633_IRQ_LOWSYS,355 PCF50633_IRQ_LOWBAT,356};357 358static const struct power_supply_desc pcf50633_mbc_adapter_desc = {359 .name = "adapter",360 .type = POWER_SUPPLY_TYPE_MAINS,361 .properties = power_props,362 .num_properties = ARRAY_SIZE(power_props),363 .get_property = &adapter_get_property,364};365 366static const struct power_supply_desc pcf50633_mbc_usb_desc = {367 .name = "usb",368 .type = POWER_SUPPLY_TYPE_USB,369 .properties = power_props,370 .num_properties = ARRAY_SIZE(power_props),371 .get_property = usb_get_property,372};373 374static const struct power_supply_desc pcf50633_mbc_ac_desc = {375 .name = "ac",376 .type = POWER_SUPPLY_TYPE_MAINS,377 .properties = power_props,378 .num_properties = ARRAY_SIZE(power_props),379 .get_property = ac_get_property,380};381 382static int pcf50633_mbc_probe(struct platform_device *pdev)383{384 struct power_supply_config psy_cfg = {};385 struct power_supply_config usb_psy_cfg;386 struct pcf50633_mbc *mbc;387 int i;388 u8 mbcs1;389 390 mbc = devm_kzalloc(&pdev->dev, sizeof(*mbc), GFP_KERNEL);391 if (!mbc)392 return -ENOMEM;393 394 platform_set_drvdata(pdev, mbc);395 mbc->pcf = dev_to_pcf50633(pdev->dev.parent);396 397 /* Set up IRQ handlers */398 for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)399 pcf50633_register_irq(mbc->pcf, mbc_irq_handlers[i],400 pcf50633_mbc_irq_handler, mbc);401 402 psy_cfg.supplied_to = mbc->pcf->pdata->batteries;403 psy_cfg.num_supplicants = mbc->pcf->pdata->num_batteries;404 psy_cfg.drv_data = mbc;405 406 /* Create power supplies */407 mbc->adapter = devm_power_supply_register(&pdev->dev,408 &pcf50633_mbc_adapter_desc,409 &psy_cfg);410 if (IS_ERR(mbc->adapter)) {411 dev_err(mbc->pcf->dev, "failed to register adapter\n");412 return PTR_ERR(mbc->adapter);413 }414 415 usb_psy_cfg = psy_cfg;416 usb_psy_cfg.attr_grp = pcf50633_mbc_sysfs_groups;417 418 mbc->usb = devm_power_supply_register(&pdev->dev,419 &pcf50633_mbc_usb_desc,420 &usb_psy_cfg);421 if (IS_ERR(mbc->usb)) {422 dev_err(mbc->pcf->dev, "failed to register usb\n");423 return PTR_ERR(mbc->usb);424 }425 426 mbc->ac = devm_power_supply_register(&pdev->dev,427 &pcf50633_mbc_ac_desc,428 &psy_cfg);429 if (IS_ERR(mbc->ac)) {430 dev_err(mbc->pcf->dev, "failed to register ac\n");431 return PTR_ERR(mbc->ac);432 }433 434 mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1);435 if (mbcs1 & PCF50633_MBCS1_USBPRES)436 pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc);437 if (mbcs1 & PCF50633_MBCS1_ADAPTPRES)438 pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc);439 440 return 0;441}442 443static void pcf50633_mbc_remove(struct platform_device *pdev)444{445 struct pcf50633_mbc *mbc = platform_get_drvdata(pdev);446 int i;447 448 /* Remove IRQ handlers */449 for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)450 pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]);451}452 453static struct platform_driver pcf50633_mbc_driver = {454 .driver = {455 .name = "pcf50633-mbc",456 },457 .probe = pcf50633_mbc_probe,458 .remove_new = pcf50633_mbc_remove,459};460 461module_platform_driver(pcf50633_mbc_driver);462 463MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");464MODULE_DESCRIPTION("PCF50633 mbc driver");465MODULE_LICENSE("GPL");466MODULE_ALIAS("platform:pcf50633-mbc");467