drivers/power/max8925_power.c

   1 /*
   2  * Battery driver for Maxim MAX8925
   3  *
   4  * Copyright (c) 2009-2010 Marvell International Ltd.
   5  *      Haojian Zhuang <haojian.zhuang@marvell.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/err.h>
  14 #include <linux/slab.h>
  15 #include <linux/of.h>
  16 #include <linux/i2c.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/power_supply.h>
  20 #include <linux/mfd/max8925.h>
  21
  22 /* registers in GPM */
  23 #define MAX8925_OUT5VEN                 0x54
  24 #define MAX8925_OUT3VEN                 0x58
  25 #define MAX8925_CHG_CNTL1               0x7c
  26
  27 /* bits definition */
  28 #define MAX8925_CHG_STAT_VSYSLOW        (1 << 0)
  29 #define MAX8925_CHG_STAT_MODE_MASK      (3 << 2)
  30 #define MAX8925_CHG_STAT_EN_MASK        (1 << 4)
  31 #define MAX8925_CHG_MBDET               (1 << 1)
  32 #define MAX8925_CHG_AC_RANGE_MASK       (3 << 6)
  33
  34 /* registers in ADC */
  35 #define MAX8925_ADC_RES_CNFG1           0x06
  36 #define MAX8925_ADC_AVG_CNFG1           0x07
  37 #define MAX8925_ADC_ACQ_CNFG1           0x08
  38 #define MAX8925_ADC_ACQ_CNFG2           0x09
  39 /* 2 bytes registers in below. MSB is 1st, LSB is 2nd. */
  40 #define MAX8925_ADC_AUX2                0x62
  41 #define MAX8925_ADC_VCHG                0x64
  42 #define MAX8925_ADC_VBBATT              0x66
  43 #define MAX8925_ADC_VMBATT              0x68
  44 #define MAX8925_ADC_ISNS                0x6a
  45 #define MAX8925_ADC_THM                 0x6c
  46 #define MAX8925_ADC_TDIE                0x6e
  47 #define MAX8925_CMD_AUX2                0xc8
  48 #define MAX8925_CMD_VCHG                0xd0
  49 #define MAX8925_CMD_VBBATT              0xd8
  50 #define MAX8925_CMD_VMBATT              0xe0
  51 #define MAX8925_CMD_ISNS                0xe8
  52 #define MAX8925_CMD_THM                 0xf0
  53 #define MAX8925_CMD_TDIE                0xf8
  54
  55 enum {
  56         MEASURE_AUX2,
  57         MEASURE_VCHG,
  58         MEASURE_VBBATT,
  59         MEASURE_VMBATT,
  60         MEASURE_ISNS,
  61         MEASURE_THM,
  62         MEASURE_TDIE,
  63         MEASURE_MAX,
  64 };
  65
  66 struct max8925_power_info {
  67         struct max8925_chip     *chip;
  68         struct i2c_client       *gpm;
  69         struct i2c_client       *adc;
  70
  71         struct power_supply     ac;
  72         struct power_supply     usb;
  73         struct power_supply     battery;
  74         int                     irq_base;
  75         unsigned                ac_online:1;
  76         unsigned                usb_online:1;
  77         unsigned                bat_online:1;
  78         unsigned                chg_mode:2;
  79         unsigned                batt_detect:1;  /* detecing MB by ID pin */
  80         unsigned                topoff_threshold:2;
  81         unsigned                fast_charge:3;
  82         unsigned                no_temp_support:1;
  83         unsigned                no_insert_detect:1;
  84
  85         int (*set_charger) (int);
  86 };
  87
  88 static int __set_charger(struct max8925_power_info *info, int enable)
  89 {
  90         struct max8925_chip *chip = info->chip;
  91         if (enable) {
  92                 /* enable charger in platform */
  93                 if (info->set_charger)
  94                         info->set_charger(1);
  95                 /* enable charger */
  96                 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 0);
  97         } else {
  98                 /* disable charge */
  99                 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
 100                 if (info->set_charger)
 101                         info->set_charger(0);
 102         }
 103         dev_dbg(chip->dev, "%s\n", (enable) ? "Enable charger"
 104                 : "Disable charger");
 105         return 0;
 106 }
 107
 108 static irqreturn_t max8925_charger_handler(int irq, void *data)
 109 {
 110         struct max8925_power_info *info = (struct max8925_power_info *)data;
 111         struct max8925_chip *chip = info->chip;
 112
 113         switch (irq - chip->irq_base) {
 114         case MAX8925_IRQ_VCHG_DC_R:
 115                 info->ac_online = 1;
 116                 __set_charger(info, 1);
 117                 dev_dbg(chip->dev, "Adapter inserted\n");
 118                 break;
 119         case MAX8925_IRQ_VCHG_DC_F:
 120                 info->ac_online = 0;
 121                 __set_charger(info, 0);
 122                 dev_dbg(chip->dev, "Adapter removed\n");
 123                 break;
 124         case MAX8925_IRQ_VCHG_THM_OK_F:
 125                 /* Battery is not ready yet */
 126                 dev_dbg(chip->dev, "Battery temperature is out of range\n");
 127         case MAX8925_IRQ_VCHG_DC_OVP:
 128                 dev_dbg(chip->dev, "Error detection\n");
 129                 __set_charger(info, 0);
 130                 break;
 131         case MAX8925_IRQ_VCHG_THM_OK_R:
 132                 /* Battery is ready now */
 133                 dev_dbg(chip->dev, "Battery temperature is in range\n");
 134                 break;
 135         case MAX8925_IRQ_VCHG_SYSLOW_R:
 136                 /* VSYS is low */
 137                 dev_info(chip->dev, "Sys power is too low\n");
 138                 break;
 139         case MAX8925_IRQ_VCHG_SYSLOW_F:
 140                 dev_dbg(chip->dev, "Sys power is above low threshold\n");
 141                 break;
 142         case MAX8925_IRQ_VCHG_DONE:
 143                 __set_charger(info, 0);
 144                 dev_dbg(chip->dev, "Charging is done\n");
 145                 break;
 146         case MAX8925_IRQ_VCHG_TOPOFF:
 147                 dev_dbg(chip->dev, "Charging in top-off mode\n");
 148                 break;
 149         case MAX8925_IRQ_VCHG_TMR_FAULT:
 150                 __set_charger(info, 0);
 151                 dev_dbg(chip->dev, "Safe timer is expired\n");
 152                 break;
 153         case MAX8925_IRQ_VCHG_RST:
 154                 __set_charger(info, 0);
 155                 dev_dbg(chip->dev, "Charger is reset\n");
 156                 break;
 157         }
 158         return IRQ_HANDLED;
 159 }
 160
 161 static int start_measure(struct max8925_power_info *info, int type)
 162 {
 163         unsigned char buf[2] = {0, 0};
 164         int meas_cmd;
 165         int meas_reg = 0, ret;
 166
 167         switch (type) {
 168         case MEASURE_VCHG:
 169                 meas_cmd = MAX8925_CMD_VCHG;
 170                 meas_reg = MAX8925_ADC_VCHG;
 171                 break;
 172         case MEASURE_VBBATT:
 173                 meas_cmd = MAX8925_CMD_VBBATT;
 174                 meas_reg = MAX8925_ADC_VBBATT;
 175                 break;
 176         case MEASURE_VMBATT:
 177                 meas_cmd = MAX8925_CMD_VMBATT;
 178                 meas_reg = MAX8925_ADC_VMBATT;
 179                 break;
 180         case MEASURE_ISNS:
 181                 meas_cmd = MAX8925_CMD_ISNS;
 182                 meas_reg = MAX8925_ADC_ISNS;
 183                 break;
 184         default:
 185                 return -EINVAL;
 186         }
 187
 188         max8925_reg_write(info->adc, meas_cmd, 0);
 189         max8925_bulk_read(info->adc, meas_reg, 2, buf);
 190         ret = ((buf[0]<<8) | buf[1]) >> 4;
 191
 192         return ret;
 193 }
 194
 195 static int max8925_ac_get_prop(struct power_supply *psy,
 196                                enum power_supply_property psp,
 197                                union power_supply_propval *val)
 198 {
 199         struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
 200         int ret = 0;
 201
 202         switch (psp) {
 203         case POWER_SUPPLY_PROP_ONLINE:
 204                 val->intval = info->ac_online;
 205                 break;
 206         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 207                 if (info->ac_online) {
 208                         ret = start_measure(info, MEASURE_VCHG);
 209                         if (ret >= 0) {
 210                                 val->intval = ret * 2000;       /* unit is uV */
 211                                 goto out;
 212                         }
 213                 }
 214                 ret = -ENODATA;
 215                 break;
 216         default:
 217                 ret = -ENODEV;
 218                 break;
 219         }
 220 out:
 221         return ret;
 222 }
 223
 224 static enum power_supply_property max8925_ac_props[] = {
 225         POWER_SUPPLY_PROP_ONLINE,
 226         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 227 };
 228
 229 static int max8925_usb_get_prop(struct power_supply *psy,
 230                                 enum power_supply_property psp,
 231                                 union power_supply_propval *val)
 232 {
 233         struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
 234         int ret = 0;
 235
 236         switch (psp) {
 237         case POWER_SUPPLY_PROP_ONLINE:
 238                 val->intval = info->usb_online;
 239                 break;
 240         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 241                 if (info->usb_online) {
 242                         ret = start_measure(info, MEASURE_VCHG);
 243                         if (ret >= 0) {
 244                                 val->intval = ret * 2000;       /* unit is uV */
 245                                 goto out;
 246                         }
 247                 }
 248                 ret = -ENODATA;
 249                 break;
 250         default:
 251                 ret = -ENODEV;
 252                 break;
 253         }
 254 out:
 255         return ret;
 256 }
 257
 258 static enum power_supply_property max8925_usb_props[] = {
 259         POWER_SUPPLY_PROP_ONLINE,
 260         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 261 };
 262
 263 static int max8925_bat_get_prop(struct power_supply *psy,
 264                                 enum power_supply_property psp,
 265                                 union power_supply_propval *val)
 266 {
 267         struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
 268         int ret = 0;
 269
 270         switch (psp) {
 271         case POWER_SUPPLY_PROP_ONLINE:
 272                 val->intval = info->bat_online;
 273                 break;
 274         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 275                 if (info->bat_online) {
 276                         ret = start_measure(info, MEASURE_VMBATT);
 277                         if (ret >= 0) {
 278                                 val->intval = ret * 2000;       /* unit is uV */
 279                                 ret = 0;
 280                                 break;
 281                         }
 282                 }
 283                 ret = -ENODATA;
 284                 break;
 285         case POWER_SUPPLY_PROP_CURRENT_NOW:
 286                 if (info->bat_online) {
 287                         ret = start_measure(info, MEASURE_ISNS);
 288                         if (ret >= 0) {
 289                                 /* assume r_sns is 0.02 */
 290                                 ret = ((ret * 6250) - 3125) /* uA */;
 291                                 val->intval = 0;
 292                                 if (ret > 0)
 293                                         val->intval = ret; /* unit is mA */
 294                                 ret = 0;
 295                                 break;
 296                         }
 297                 }
 298                 ret = -ENODATA;
 299                 break;
 300         case POWER_SUPPLY_PROP_CHARGE_TYPE:
 301                 if (!info->bat_online) {
 302                         ret = -ENODATA;
 303                         break;
 304                 }
 305                 ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
 306                 ret = (ret & MAX8925_CHG_STAT_MODE_MASK) >> 2;
 307                 switch (ret) {
 308                 case 1:
 309                         val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
 310                         break;
 311                 case 0:
 312                 case 2:
 313                         val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
 314                         break;
 315                 case 3:
 316                         val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
 317                         break;
 318                 }
 319                 ret = 0;
 320                 break;
 321         case POWER_SUPPLY_PROP_STATUS:
 322                 if (!info->bat_online) {
 323                         ret = -ENODATA;
 324                         break;
 325                 }
 326                 ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
 327                 if (info->usb_online || info->ac_online) {
 328                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 329                         if (ret & MAX8925_CHG_STAT_EN_MASK)
 330                                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
 331                 } else
 332                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 333                 ret = 0;
 334                 break;
 335         default:
 336                 ret = -ENODEV;
 337                 break;
 338         }
 339         return ret;
 340 }
 341
 342 static enum power_supply_property max8925_battery_props[] = {
 343         POWER_SUPPLY_PROP_ONLINE,
 344         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 345         POWER_SUPPLY_PROP_CURRENT_NOW,
 346         POWER_SUPPLY_PROP_CHARGE_TYPE,
 347         POWER_SUPPLY_PROP_STATUS,
 348 };
 349
 350 #define REQUEST_IRQ(_irq, _name)                                        \
 351 do {                                                                    \
 352         ret = request_threaded_irq(chip->irq_base + _irq, NULL,         \
 353                                     max8925_charger_handler,            \
 354                                     IRQF_ONESHOT, _name, info);         \
 355         if (ret)                                                        \
 356                 dev_err(chip->dev, "Failed to request IRQ #%d: %d\n",   \
 357                         _irq, ret);                                     \
 358 } while (0)
 359
 360 static int max8925_init_charger(struct max8925_chip *chip,
 361                                           struct max8925_power_info *info)
 362 {
 363         int ret;
 364
 365         REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_OVP, "ac-ovp");
 366         if (!info->no_insert_detect) {
 367                 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_F, "ac-remove");
 368                 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_R, "ac-insert");
 369         }
 370         if (!info->no_temp_support) {
 371                 REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_R, "batt-temp-in-range");
 372                 REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_F, "batt-temp-out-range");
 373         }
 374         REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_F, "vsys-high");
 375         REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_R, "vsys-low");
 376         REQUEST_IRQ(MAX8925_IRQ_VCHG_RST, "charger-reset");
 377         REQUEST_IRQ(MAX8925_IRQ_VCHG_DONE, "charger-done");
 378         REQUEST_IRQ(MAX8925_IRQ_VCHG_TOPOFF, "charger-topoff");
 379         REQUEST_IRQ(MAX8925_IRQ_VCHG_TMR_FAULT, "charger-timer-expire");
 380
 381         info->usb_online = 0;
 382         info->bat_online = 0;
 383
 384         /* check for power - can miss interrupt at boot time */
 385         if (start_measure(info, MEASURE_VCHG) * 2000 > 500000)
 386                 info->ac_online = 1;
 387         else
 388                 info->ac_online = 0;
 389
 390         ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
 391         if (ret >= 0) {
 392                 /*
 393                  * If battery detection is enabled, ID pin of battery is
 394                  * connected to MBDET pin of MAX8925. It could be used to
 395                  * detect battery presence.
 396                  * Otherwise, we have to assume that battery is always on.
 397                  */
 398                 if (info->batt_detect)
 399                         info->bat_online = (ret & MAX8925_CHG_MBDET) ? 0 : 1;
 400                 else
 401                         info->bat_online = 1;
 402                 if (ret & MAX8925_CHG_AC_RANGE_MASK)
 403                         info->ac_online = 1;
 404                 else
 405                         info->ac_online = 0;
 406         }
 407         /* disable charge */
 408         max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
 409         /* set charging current in charge topoff mode */
 410         max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 3 << 5,
 411                          info->topoff_threshold << 5);
 412         /* set charing current in fast charge mode */
 413         max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 7, info->fast_charge);
 414
 415         return 0;
 416 }
 417
 418 static int max8925_deinit_charger(struct max8925_power_info *info)
 419 {
 420         struct max8925_chip *chip = info->chip;
 421         int irq;
 422
 423         irq = chip->irq_base + MAX8925_IRQ_VCHG_DC_OVP;
 424         for (; irq <= chip->irq_base + MAX8925_IRQ_VCHG_TMR_FAULT; irq++)
 425                 free_irq(irq, info);
 426
 427         return 0;
 428 }
 429
 430 #ifdef CONFIG_OF
 431 static struct max8925_power_pdata *
 432 max8925_power_dt_init(struct platform_device *pdev)
 433 {
 434         struct device_node *nproot = pdev->dev.parent->of_node;
 435         struct device_node *np;
 436         int batt_detect;
 437         int topoff_threshold;
 438         int fast_charge;
 439         int no_temp_support;
 440         int no_insert_detect;
 441         struct max8925_power_pdata *pdata;
 442
 443         if (!nproot)
 444                 return pdev->dev.platform_data;
 445
 446         np = of_find_node_by_name(nproot, "charger");
 447         if (!np) {
 448                 dev_err(&pdev->dev, "failed to find charger node\n");
 449                 return NULL;
 450         }
 451
 452         pdata = devm_kzalloc(&pdev->dev,
 453                         sizeof(struct max8925_power_pdata),
 454                         GFP_KERNEL);
 455
 456         of_property_read_u32(np, "topoff-threshold", &topoff_threshold);
 457         of_property_read_u32(np, "batt-detect", &batt_detect);
 458         of_property_read_u32(np, "fast-charge", &fast_charge);
 459         of_property_read_u32(np, "no-insert-detect", &no_insert_detect);
 460         of_property_read_u32(np, "no-temp-support", &no_temp_support);
 461
 462         pdata->batt_detect = batt_detect;
 463         pdata->fast_charge = fast_charge;
 464         pdata->topoff_threshold = topoff_threshold;
 465         pdata->no_insert_detect = no_insert_detect;
 466         pdata->no_temp_support = no_temp_support;
 467
 468         return pdata;
 469 }
 470 #else
 471 static struct max8925_power_pdata *
 472 max8925_power_dt_init(struct platform_device *pdev)
 473 {
 474         return pdev->dev.platform_data;
 475 }
 476 #endif
 477
 478 static int max8925_power_probe(struct platform_device *pdev)
 479 {
 480         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
 481         struct max8925_power_pdata *pdata = NULL;
 482         struct max8925_power_info *info;
 483         int ret;
 484
 485         pdata = max8925_power_dt_init(pdev);
 486         if (!pdata) {
 487                 dev_err(&pdev->dev, "platform data isn't assigned to "
 488                         "power supply\n");
 489                 return -EINVAL;
 490         }
 491
 492         info = kzalloc(sizeof(struct max8925_power_info), GFP_KERNEL);
 493         if (!info)
 494                 return -ENOMEM;
 495         info->chip = chip;
 496         info->gpm = chip->i2c;
 497         info->adc = chip->adc;
 498         platform_set_drvdata(pdev, info);
 499
 500         info->ac.name = "max8925-ac";
 501         info->ac.type = POWER_SUPPLY_TYPE_MAINS;
 502         info->ac.properties = max8925_ac_props;
 503         info->ac.num_properties = ARRAY_SIZE(max8925_ac_props);
 504         info->ac.get_property = max8925_ac_get_prop;
 505         info->ac.supplied_to = pdata->supplied_to;
 506         info->ac.num_supplicants = pdata->num_supplicants;
 507         ret = power_supply_register(&pdev->dev, &info->ac);
 508         if (ret)
 509                 goto out;
 510         info->ac.dev->parent = &pdev->dev;
 511
 512         info->usb.name = "max8925-usb";
 513         info->usb.type = POWER_SUPPLY_TYPE_USB;
 514         info->usb.properties = max8925_usb_props;
 515         info->usb.num_properties = ARRAY_SIZE(max8925_usb_props);
 516         info->usb.get_property = max8925_usb_get_prop;
 517         info->usb.supplied_to = pdata->supplied_to;
 518         info->usb.num_supplicants = pdata->num_supplicants;
 519
 520         ret = power_supply_register(&pdev->dev, &info->usb);
 521         if (ret)
 522                 goto out_usb;
 523         info->usb.dev->parent = &pdev->dev;
 524
 525         info->battery.name = "max8925-battery";
 526         info->battery.type = POWER_SUPPLY_TYPE_BATTERY;
 527         info->battery.properties = max8925_battery_props;
 528         info->battery.num_properties = ARRAY_SIZE(max8925_battery_props);
 529         info->battery.get_property = max8925_bat_get_prop;
 530         ret = power_supply_register(&pdev->dev, &info->battery);
 531         if (ret)
 532                 goto out_battery;
 533         info->battery.dev->parent = &pdev->dev;
 534
 535         info->batt_detect = pdata->batt_detect;
 536         info->topoff_threshold = pdata->topoff_threshold;
 537         info->fast_charge = pdata->fast_charge;
 538         info->set_charger = pdata->set_charger;
 539         info->no_temp_support = pdata->no_temp_support;
 540         info->no_insert_detect = pdata->no_insert_detect;
 541
 542         max8925_init_charger(chip, info);
 543         return 0;
 544 out_battery:
 545         power_supply_unregister(&info->battery);
 546 out_usb:
 547         power_supply_unregister(&info->ac);
 548 out:
 549         kfree(info);
 550         return ret;
 551 }
 552
 553 static int max8925_power_remove(struct platform_device *pdev)
 554 {
 555         struct max8925_power_info *info = platform_get_drvdata(pdev);
 556
 557         if (info) {
 558                 power_supply_unregister(&info->ac);
 559                 power_supply_unregister(&info->usb);
 560                 power_supply_unregister(&info->battery);
 561                 max8925_deinit_charger(info);
 562                 kfree(info);
 563         }
 564         return 0;
 565 }
 566
 567 static struct platform_driver max8925_power_driver = {
 568         .probe  = max8925_power_probe,
 569         .remove = max8925_power_remove,
 570         .driver = {
 571                 .name   = "max8925-power",
 572         },
 573 };
 574
 575 module_platform_driver(max8925_power_driver);
 576
 577 MODULE_LICENSE("GPL");
 578 MODULE_DESCRIPTION("Power supply driver for MAX8925");
 579 MODULE_ALIAS("platform:max8925-power");